Light passes through a rectangular glass slab and through a triangular glass prism. Refraction through a rectangular glass slab to understand the refraction of light through a glass slab consider the figure given below which shows the refraction of light through a rectangular glass slab. Dispersion occurs when light is passed through a prism. Here in this figure ao is the light ray travelling in air and incident on glass slab at point o. Measure the angle of incidence, angle of refraction, angle of. How to show with a diagram why a glass slab doesnt show. A lightray of wavelength nm traveling through air is incident on a smooth, flat slab of crown glass refractive index 1. When light travels from one medium to another, it generally bends,this bending is called refraction. In the case of a glass slab, the opposite sides are parallel and therefore different colors emerge.
To study refraction of light in rectangular glass slab. Lets explore refraction of light through any parallel sided medium. Closing your one eye,adjust the position of your head in such a way that the images of the pins a and b lie in the same straight line. Measure the angle of incidence, angle of refraction, angle of emergence and interpret the result. The perpendicular distance between the direction of the incident ray and emergent ray is called lateral shift. A beam of light in air is incident on a glass slab at an. When light rays travelling through air enters glass slab, they get refracted and bend towards the normal. Class 10 physics practical glass slab introduction. A student looks through it and finds that the normal shift is x x x, find x x x. Refraction of light through a glass slab refraction through a rectangular glass slab and principle of reversibility of light. Place the given glass slab nearly in the middle of the sheet. A beam of light in air is incident on a glass slab at an angle of incidence.
Refraction of light through a glass prism refraction phenomenon. Icse solutions for class 10 physics refraction of light. Reflection and refraction equipment acrylic block set, planeconcaveconvex universal mirror, cork board, cork board stand, pins, flashlight, protractor, ruler, mirror worksheet, rectangular block worksheet, equilateral prism worksheet, converging lens worksheet. For no bending of a ray of light through a glass slab, angle of incidence must be a00 b 300 c 600 d 900 ans. Thus the refracted ray bends towards the normal making r of light passing through a glass slab not. Kept the eyes close to the glass slab while placing pins p 3. What is the wavelength of the light inside the glass. Mar 21, 2017 a light ray incident on a rectangular glass it gets refracted by glass slab. Sep 15, 2006 when the light enters the upper face of the glass slab refraction takes place and when it leaves the second face refraction takes place again but there is a lateral shift between the incident ray and emergent raylike this refraction takes place thrh a glass slab. Gcse physics refraction of light through a glass block. Refraction is merely one of several possible boundary behaviors by which a light wave could behave when it encounters a new medium or an.
Will also see why things appear to shift lateral shift when looked through such a medium. To observe refraction and lateral deviation of a beam of light incident obliquely on a glass slab. Tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. 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. Refraction of light when it passes from one medium to the other obeys snells law, which states. Using proper ray diagram, explain in what way does the direction of the two emergent beams differs with respect to the incident beam of light. Mirage light from sky hot road or sand focusing optical system.
Refraction of light is a phenomenon wherein light bends and travels from one transparent substance to another. On entering the glass slab, it bends towards normal and travels along ef. Glass slab, drawing board, white paper sheet, drawing pins, office pins, protractor. Consider a rectangular glass slab, as shown in figure. Consider that a ray of light enters the glass slab along ae. Nov 17, 20 a slab of glass with an index of refraction of 1. To observe refraction and lateral deviation of a beam of. Well, in fact, dispersion does occur when light is passed through a glass slab it is just harder to observe that way. Refraction of light through glass slab in hindi and english dual audio.
Light passes through a rectangular glass slab and through. This part of the light travels slower than it would in a vacuum, as it is now inside glass. Ncert class 10 science lab manual refraction through glass. Ace your next assignment with help from a professional writer. Refraction of light in glass slab using laser light. In a prism the emerging ray is not parallel but split due to change in wavelength.
At the interface, it is bent in one direction if the material it enters is denser when light slows down and in the. Sunlight is observed to focus at a point 20 cm behind a lens. It gets a interface of a glass and the air another medium. The dispersion is caused due to the the difference in the angle of deviation for different colours. 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. The dispersion of a light ray does not take place in a glass. Mar 04, 2012 dispersion occurs when light is passed through a prism. So, have you ever observed the bottom of a thick glass slab when a printed paper is kept below it. Ncert class 10 science lab manual refraction through glass slab. On entering the glass slab, it bends towards normal and travels along ef at an angle of refraction r.
This video explains with the use of an experiment how light is refracted through a glass slab. Refraction of light part i this laboratory was designed to investigate the behaviour of light as it travels through a less dense into a denser medium. A ray of light traveling in water is incident on its surface open to. A b b p p r r q atmosphere to apparent sun light path to true sun earth 10. Fix a sheet of white paper on a drawing board with drawing pins. Refraction through a glass slab and the refractive index. A drawing board, rectangular glass slab, office pins, sheet of white paper, a protractor and sharply pointed pencil. Lets us understand this concept indepth with an illustration. A light ray incident on a rectangular glass it gets refracted by glass slab.
If you take a glass prism, you can see that it has 2 triangular bases and three rectangular lateral surfaces, inclined at an angle. Lets look at a top view of a triangular prism with a ray of light entering it. When a collimated beam of white light enters a rectangular prism, it develops slightly coloured edges due to the dispersive refraction of the glass. Why does dispersion take place when light is passed through prism and not through glass slab. Find the angle of refraction if the angle of incidence is a 60o, b 45o, and c 30o. A beam of light in air strikes a slab of glass with refractive index 1. It means that light is travelling from a rarer medium i. Drawing board, sheet of paper, board pins, rectangular glass slab. Let us consider that light enters from medium 1 to medium 2. To trace the path of a ray of light passing through a rectangular glass slab for different angles of incidence and to measure the angle of incidence, angle of refraction and angle of emergence and. Lateral shift when a ray of light is incident obliquely on a parallel sided glass slab the emergent ray shifts laterally. Created by the best teachers and used by over 51,00,000 students. Now the direction of refracted ray changes again when it comes out of the glass slab into air.
Icse solutions for class 10 physics refraction of light a. Solved a slab of glass with an index of refraction of. To trace the path of a ray of light passing through a rectangular glass slab for different angles of incidence. On entering the glass slab, it bends towards normal and travels along. Kept the eye close to the glass slab while placing both the pins p 3 and p 4. 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. Kavita answer a light ray is refracted bent when it passes from one medium to another at an angle and its speed changes. In what way does the direction of the two emergent beams differ and why. Why does dispersion take place when light is passed through. Tracing the path of a ray of light passing through a rectangular. Dispersion takes place inside the slab, but, since the rays which emerge from the slab all run parallel to one another, the dispersed colours recombine to form white light again, and no dispersion is observed except at the very edges of the beam.
Fasten a sheet of paper to a drawing board or flat surface into which pins can be pressed easily. Explain the refraction of light through a glass slab. Refraction through glass slab a refraction through a rectangular glass slab and principle of reversibility of light. For no bending of a ray of light through a glass slab, angle of incidence must be a 00 b 300 c 600 d 900 ans. But the path light in such propagation is laterally. Now the direction of refracted ray changes again when it. When a light ray enter from rarer medium to denser medium or denser to. In going from a less dens e medium air to a more dense medium glass, light bends towards the normal. Applying snells law when the light is incident on the glass slabs surface, sin. When light travels through something else, such as glass, diamond, or plastic, it travels at a different speed. Determine the angle of incidence if the angle of re. Here in this figure ao is the light ray traveling in air and incident on glass slab at point o.
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. This means that i r the angle i is greater than the angle r. Dec 03, 2016 to observe refraction and lateral deviation of a beam of light incident obliquely on a glass slab. A ray ae is incident on the face pq at an angle of incidence i. Refraction is an important characteristic of lenses, allowing them to focus a beam of light onto a single point, and is also responsible for a variety of familiar phenomena, such as the apparent distortion of objects partially submerged in water. 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. In the case of a glass slab, the opposite sides are parallel and therefore different colors emerge parallel to each other and are seen simultaneously. Thus the refracted ray bends towards the normal making r of the slab, the ray ef while travelling through glass meets the surface sr of air which is a rarer medium. 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. In rectangular glass slab the ray undergoes only refraction and emerges out parallel. A glass slab produces dispersion but the resulting rainbow like spectrum effect cannot be seen. Refraction through glass slab a ray of light incident on one of the parallel faces of a rectangular glass slab, emerges out of the opposite parallel face gets absorbed into the body of the. When light is traveling from air to a glass or plastic prism, red light travels faster in the prism than all other colors and bends the least. Explain refraction of light through a glass slab a plus topper.
Refraction of light through glass slab in hindi and. Look through the glass slab along the plane of the paper from the side sr and move your head until the images of the two pins a and b are seen clearly. Light is refracted by the glass slab is very much responsible for this fact. To trace the course of different rays of light through a rectangular glass slab at different angles of incidence, measure the angle of incidence, refraction and. Science lab manual class 10 free download pdf refraction through glass slab. Kept the eyes far from the glass slab while placing both the pins p 3 and p 4. Why does a light ray incident on a rectangular glass slab. Snells law gives the relationship between angles of incidence and angle of refraction. A glass slab acts in this fashion as it could a join of two prisms which dispersed light from one surface is again undone by the other surface. Thus the refracted ray bends towards the normal making r ray of light falls normally on a glass. If a ray of light falls normally onto a glass slab, the three optical phenomenon all happen. Refraction of light through a glass prism refraction. Passing of monochromatic light through a prism light ray bends toward the normal bends away from the normal slide27.
Light passes through a rectangular glass slab and through a. Explain refraction of light through a glass slab a plus. To understand the refraction of light through a glass slab consider the figure given below which shows the refraction of light through a rectangular glass slab. This is due to the fact that all the refracted wavelengths emerge parallel to their incident direction.
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