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L20 : Refraction in glass slab & examples - Ray Optics, Physics, Class 12 Video Lecture

FAQs on L20 : Refraction in glass slab & examples - Ray Optics, Physics, Class 12 Video Lecture

1. What is refraction in a glass slab?

Ans. Refraction in a glass slab refers to the bending of a light ray as it passes through a glass slab. This phenomenon occurs due to the change in the speed of light when it enters a medium with a different refractive index, such as glass. The bending of the light ray is caused by the difference in the speed of light in the two media.

2. How does refraction in a glass slab occur?

Ans. Refraction in a glass slab occurs because the speed of light changes when it enters the glass medium. When the light ray enters the glass slab at an angle, it slows down and bends towards the normal, which is an imaginary line perpendicular to the surface of the slab. Upon exiting the glass slab, the light ray speeds up again and bends away from the normal.

3. What are some examples of refraction in a glass slab?

Ans. Some examples of refraction in a glass slab include the following: - When a pencil is partially immersed in a glass of water, it appears bent due to refraction in the water and the glass. - When a light ray passes through a glass window, it undergoes refraction as it enters and exits the glass. - The formation of rainbows is also a result of refraction in water droplets, which act as tiny glass slabs.

4. How does the thickness of a glass slab affect refraction?

Ans. The thickness of a glass slab does not significantly affect the refraction of light. The main factors that determine the degree of refraction are the angle of incidence, the refractive index of the glass, and the wavelength of light. As long as the light ray enters and exits the glass slab at different angles, the refraction will occur regardless of the thickness of the slab.

5. What is the application of refraction in glass slabs?

Ans. Refraction in glass slabs has various applications in everyday life and scientific experiments. Some of the applications include: - Lenses used in cameras, telescopes, and eyeglasses utilize the principles of refraction in glass slabs to focus light and correct vision. - Optical fibers, which are used for communication and data transmission, rely on the refraction of light in glass slabs to guide the light signals through the fibers. - Spectacles with different types of lenses use refraction to correct various vision problems such as nearsightedness and farsightedness.

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Oct 02, 2025 Last updated

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