Refraction of light through a glass slab pdf

Will also see why things appear to shift lateral shift when looked through such a medium. Measure the angle of incidence, angle of refraction, angle of. Light travels through a block of glass, then remerges into air. Fasten a sheet of paper to a drawing board or flat surface into which pins can be pressed easily. A slab is a piece of transparent material with rectangular faces. When light travels from one medium to another, it generally bends,this bending is called refraction. Gcse physics refraction of light through a glass block. Letters of a book appear to be raised when seen through a glass slab. Below is an experiment to trace the path of a light ray passing through the rectangular glass slab. This is because in glass prism, the incident ray of light is not parallel to emergent ray of light.

To trace the path of the rays of light through a glass prism. Refraction of light through a glass slab refraction through a rectangular glass slab and principle of reversibility of light. Cbse class 10 science lab manual refraction through glass slab aim to trace the path of a ray of light passing through a rectangular glass slab for different angles of incidence. Lets explore refraction of light through any parallel sided medium. On entering the glass slab, it bends towards normal and travels along ef at an angle of refraction r. Avanti light reflection and refraction light reflection and refraction. Ncert class 10 science lab manual refraction through glass slab. Question 3 draw a diagram showing refraction of light through a glass slab. Refraction through a rectangular glass slab and principle of reversibility of light. Refraction bouncing back of light when it strikes on a polished surface like mirror. The law of refraction is given as incident ray and refracted ray are normal to the surface separating two media all lie in the same plane. Explain the refraction of light through the glass slab with a neat ray diagram as, tv refraction through a glass slab a thin plass slah is formed when a medium is isolated from its surroundings by two planes. To observe refraction and lateral deviation of a beam of light incident obliquely on a glass slab.

Dispersion occurs when light is passed through a prism. R the law of refraction snells law relates how a ray of light will behave when passing from one media to the other. The ratio of sine of angle of incidence to the sine of angle of refraction is constant. Moreover, the observations and graph shows that the ratio sin i sin r is a constant for any.

Class 10 science lab manual refraction experiment 6. The question pertains to refraction of a ray of light through a glass slab. Why does dispersion take place when light is passed. If youre seeing this message, it means were having trouble loading external resources on our website. Refraction of light through a glass slab class 10th.

Science class 12 physics india ray optics and optical instruments refraction at plane surfaces. The refraction of light takes place when light travels from air into glass, from glass into air, from air into water or from water into air. At least two of the flat surfaces must have an angle between them. When a ray of light passes through a rectangular glass slab, it gets bent twice at the air glass interface and at the glass air interface. The incident ray, refracted ray and normal to the interface of given two transparent media, all lie in same plane. As per snells law, 1 here, is the refractive index of glass with respect to air. However, when light passes from one medium into a second medium, the light path bends. Experimental verification of laws of refraction and determination of refractive index of glass. Ncert class 10 science lab manual refraction through prism. Class 10 science chapter 10 light reflection and refraction. If the light starts outside the slab with an angle less than 90 degrees, the light inside the slab will have an angle less than the critical angle and some light will come all the way through to the other side. Light is shone through a glass block at various angles. This phenomenon exhibited by the light rays is called refraction of light.

It is deviated from its original path by a certain angle. The ray of light changes its direction or phenomenon of refraction takes place because of difference in speed in different media. Selina solutions concise physics class 10 chapter 4. Prism is a transparent optical object with flat, polished surfaces that refract light. Refraction is also responsible for rainbows and for the splitting of white light into a rainbowspectrum as it passes through a glass prism. When a beam of light falls obliquely at the interface of the two optical media, direction of its path changes when it enters into the other medium. To trace the path of a ray of light passing through a rectangular glass slab for different angles of incidence. Refraction of light through a glass slab and a prism explain the rules for the ray diagram for spherical lenses. Placed the semicircular plastic block on the centre of a blank sheet of paper. When a ray of light enters a glass block at an angle other than the normal, it changes speed, wavelength and direction as shown below. Measure the angle of incidence, angle of refraction, angle of emergence and interpret the result. The emergent ray is parallel to the incident ray and is displaced through a distance. This means that i r the angle i is greater than the angle r.

The angle of incidence, measured from the normal to the glass. A calibrated paper template allows the angles of incidence and refraction to be. Once the light has crossed the boundary between the two media, it. As light travels through a given medium, it travels in a straight line. Here in this figure ao is the light ray travelling in air and incident on glass slab at point o. In different transparent media velocity of light is different.

Cbse class 10 science lab manual refraction through glass slab. Because the geometric path s gl in glass is multiplied by n 2 n 1, this actually reduces the optical path length and the longer path complies with fermats principle. This also happens in a lens in going from a less dens e medium air to a more dense medium glass, light bends towards the normal. When the light rays either bend or change their direction while passing from one medium to another it is called refraction of light. Here in this figure ao is the light ray traveling in air and incident on glass slab at point o. He observes all possible precautions at each step of the experiment. Sep 09, 2018 refraction of light through a glass slab refraction through a rectangular glass slab and principle of reversibility of light. Determination of the refractive index of a glass block using. Refraction through glass slab is given here,draw a line which appears in raised position on a paper and it is placed on the glass slab is placed by shiting up. Refraction of light through a glass slab pdf to trace the path of a ray of light passing through a rectangular glass slab for different angles of incidence. In your laboratory, you trace the path of light rays through a glass slab for different values of angle of incidence. Refraction and snells law reading shen and kong ch. Glass slab, drawing board, white paper sheet, drawing pins, office pins, protractor.

Let us understand it more clearly by the concept of refraction through a rectangular glass slab. Refraction of light through a rectangular glass block. Yasir sadeeq msc bedteacher govt bhs bahadurkote karnah, kupwara. A ray of light is transferred from one medium which is transparent to the another medium by changing the direction. Dec 03, 2016 to observe refraction and lateral deviation of a beam of light incident obliquely on a glass slab. The law of reflection states that the angle of incident ray equals the angle of the reflected ray, or. In the case of a glass slab, the opposite sides are parallel and therefore different colors emerge. When a ray of light pq incident on the face ab of glass slab, then it bends towards the normal since refraction takes place from rarer to denser medium. Materials required some drawing pins, a white sheet. Refraction of light through a glass block when a ray of light enters a glass block at an angle other than the normal, it changes speed, wavelength and direction as shown below. Refraction of light through prism experiment class 10 introduction. Refraction of light is the change in direction of light when it passes from one medium to another. You will find that the printed matter seems to be raised. Aug 10, 2017 lemons placed in a glass tumbler appear bigger.

A correct explanation of refraction involves two separate parts, both a result of the wave nature of light. Lets us understand this concept indepth with an illustration. Explain refraction of light and define rarerdenser medium, refracted ray. The emergent ray, o 1 e which is nothing but the refracted ray emerging out of the glass slab is parallel to the incident ray. So, it is important to know how the light refracts from one medium to another. Light reflection and refraction notes the extent of bending of ray of light at the opposite parallel faces of rectangular glass slab is equal and opposite, so the ray emerges parallel to incident ray lateral displacement depends on refractive index of glass slab thickness of the glass slab laws of refraction. Drawing board, sheet of paper, board pins, rectangular glass slab. Consider a rectangular glass slab, as shown in figure. Notes of ch 10 light refraction class 10th science.

Determination of the refractive index of a glass block. Jan 17, 2020 the refracted ray becomes parallel to the base of the prism under the minimum deviation position. In refraction of light through a glass slab, the directions of the incident ray and refracted ray are. Similarly bottom of the swimming pool which appeared to be raised. Hence, it travels from a rarer medium to a denser medium. Explain the refraction of light through the glass slab. The change of direction of light because of change of medium is known as refraction or refraction of light. Refraction of light laws of refraction refractive index. However, this holds true upto it travels through a same media. Tracing the path of a ray of light passing through a. When a beam of light fall in the glass slab it get refract twice one from air to glass and another glass to air, and their imaginary rey and refracted rey looks like parallel this shifting of ray is called lateralshiftwhereas in glass prism, whe. The refraction of light in glass prism is different from a glass slab. This video is highly rated by class 10 students and has been viewed 917 times.

So, have you ever observed the bottom of a thick glass slab when a printed paper is kept below it. Refraction of light is a phenomenon wherein light bends and travels from one transparent substance to another. This sounds correct to me since if the light ray approaches the slab almost parallel then after refracting back to air it should come out almost parallel, causing a lateral shift of exactly. A student traces the path of a ray of light through a rectangular glass slab for the different values of angle of incidence.

Physics refraction of light through a prism prism is a triangular glass, which has two triangular bases and three rectangular lateral surfaces as shown in the image given below. Refraction of light in glass slab using laser light. Remove all pins and draw the line through pin3 and pin4. The emergent ray is parallel to the incident ray and is displaced through. Background to experiment visible light is a small portion of the spectrum of electromagnetic radiation, which extends from. When a light ray is allowed to pass through a glass prism, it gets refracted twice. Draw ray diagrams showing the image formation by a concave lens when an object is placed. Explain refraction of light through a glass slab a plus topper. Snells law and the refraction of light the displacement of light by a slab of material when a ray of light passes through a pane of glass that has parallel surfaces and is surrounded by air, the emergent ray is parallel to the incident ray. The eyes and brain trace the light rays back into the water as though they had not refracted, but traveled from the object in a straight line, creating a virtual image of the object that appears at a shallower depth.

What marine recruits go through in boot camp earning the title making marines on parris island duration. To study refraction of light in rectangular glass slab physics kids projects, physics science fair project, pyhsical science, astrology, planets solar experiments for kids and also organics physics science ideas for cbse, icse, gcse, middleschool, elementary school for 5th, 6th, 7th, 8th, 9th and high school students. A ray ae is incident on the face pq at an angle of incidence i. Draw accurately the outline of the rectangular glass block. This is a simple diy science experiment that can be performed at home. Rather it is because, as an electromagnetic oscillation, light i. Physics refraction of light through a prism tutorialspoint. Multiple images in a thick plane glass plate or thick mirror. The law of refraction is also known as snells law which states that the ratio of the sine of the angle of incidence to the angle of refraction is equal to constant. From te analysis from phase matching from fermats principle of least time total internal reflection and fibers fios. Let us understand the phenomenon of refraction of light with the help of an activity. The ratio of sine of angle of incidence and sine of angle of refraction is always constant for the light of given colour and for the pair of given media.

First, at the entrance of the prism and second when the light. The change in direction of light when it passes from one medium to another obliquely, is called refraction of light. To observe refraction and lateral deviation of a beam of. A change of direction that light undergoes when it enters a medium with a different density from the one through which it has been travelling. Cbse class 10 science chapter 10 light reflection and.

All faces are transparent and opposite faces are parallel. Refraction is the property of light in which it bends from one medium to another. Lateral shift when a ray of light is incident obliquely on a parallel sided glass slab the emergent ray shifts laterally. This laboratory was designed to investigate the behaviour of light as it travels through a denser into a less dense medium. What is the refractive index of the dense flint glass with respect to alcohol. Well, in fact, dispersion does occur when light is passed through a glass slab it is just harder to observe that way.

Outline te and tm fields refraction and snells law. Let an ray of light be incident on the surface of a rectangular glass slab at an angle i, from air to glass interface. Light slows as it travels through a medium other than vacuum such as air, glass or water. In refraction of light through a glass slab, the d. The refractive index n can also be defined for a particular material as the ratio of the speed of light in vacuum or free space to the velocity of light through the material see equation 1. Cbse class 10 science practical skills refraction through glass slab.

Snells law gives the relationship between angles of incidence and angle of refraction. Class 10 physics practical glass slab introduction. When a beam of white light passes from air into a material having an index of refraction that varies with frequency, a phenomenon known as dispersion occurs, in which different coloured components. Which one out of the following is the correct representation of an angle of incidence i, angle of refraction r and angle of emergence e as shown in the diagrams. But when the ray of light is passing from glass to air, that is, from a denser medium to a rarer medium the refracted ray bends away from the normal. To determine refractive index of a glass slab using a travelling microscope. Refraction through a prism study material for iit jee. I have checked glass s refraction index and it lies in the range. Refraction of light through a glass slab explained teachoo.

The perpendicular distance between the direction of the incident ray and emergent ray is called lateral shift. For example white light, after passing through a slab of coloured glass, will emerge from the other side with a different mixture of frequencies, i. The light will be refracted by the first surface of the glass. Explain refraction of light through a glass slab a plus. Three glass slabs of different thickness but same material, a travelling microscope, lycopodium powder. Remove the glass block, draw in the emergent ray and the refracted ray and measure the angle of refraction, r. Explain the same with the help of ray diagram, when a ray of light passes through a rectangular glass slab. Take a white sheet and put a glass slab over the sheet. Practice problems a laser beam in air enters ethanol at an angle of incidence of 37. For example, when after moving through air, it passes through a glass slab or prism. Also, the angles of incidence and the angles of refraction were not directly proportional in contrary to the sin of the incident and refraction angles.

Part of the incident ray is reflected back into the. A ray of white light passes through a rectangular glass slab, entering and emerging at parallel faces. The light travels at faster speed in rare medium and at slower speed in denser medium. A beam of light is incident through the holes on side a and emerges out of the holes on the other face of the box as shown in the figure 10.

When a collimated beam of white light enters a rectangular prism, it develops slightly coloured edges due to the dispersive refraction of the glass. How is refraction from a glass slab different than the. In going from a less dens e medium air to a more dense medium glass, light bends towards the normal. Refraction is the bending of a light ray when it enters from one medium to another. Ncert class 10 science lab manual refraction through glass. A prism has a triangular base and three triangular lateral surfaces. Question 2 the refractive index of dense flint glass is 1. Dec 14, 2009 an experimental demonstration of snells law of refraction. The dispersion is caused due to the the difference in the angle of deviation for different colours. Student guide purpose to determine the refractive index of a glass block using the noparallax method. Let us now study in detail how refraction takes place in a glass prism. When light rays change the medium, the direction also changes. On entering the glass slab, it bends towards normal and travels along. A ray of light traveling in water is incident on its surface open to.

Refraction of light when it passes from one medium to the other obeys snells law, which states. After travelling inside the glass, it will again undergo refraction. Refraction through glass slab a refraction through a rectangular glass slab and principle of reversibility of light. To study refraction of light in rectangular glass slab. So, the first refracted ray bends towards normal after travelling in the glass slab. Light refraction of light through rectangular glass slab. So, the first refracted ray bends towards normal after travelling in the glass slab the ray of light travels from glass to air.