Refraction of Light
Physics ⇒ Light and Optics
Refraction of Light starts at 8 and continues till grade 12.
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See sample questions for grade 10
A coin placed at the bottom of a beaker appears to be raised when water is poured into it. Explain why.
A light ray enters from air (n = 1.0) into a medium with refractive index 1.6 at an angle of incidence of 30°. Calculate the angle of refraction. (sin 30° = 0.5)
A pencil appears bent when placed in a glass of water. Explain why this happens.
A ray of light passes from glass (n = 1.5) into air (n = 1.0) at an angle of incidence of 45°. Calculate the angle of refraction. (sin 45° = 0.707)
A ray of light passes from water (n = 1.33) to glass (n = 1.5). If the angle of incidence in water is 60°, calculate the angle of refraction in glass. (sin 60° = 0.866)
Define the term 'critical angle' in the context of refraction.
Explain why a fish in water appears to be at a different position when viewed from above the water surface.
Explain why stars appear to twinkle at night.
If the refractive index of glass is 1.5 and the speed of light in vacuum is 3 × 10⁸ m/s, what is the speed of light in glass?
If the refractive index of medium A with respect to B is 2, what is the refractive index of medium B with respect to A?
State the law of refraction (Snell's Law).
The refractive index of water with respect to air is 1.33. If the angle of incidence in air is 30°, calculate the angle of refraction in water. (Use sin 30° = 0.5)
What is meant by the term 'optically denser medium'?
What is refraction of light?
What is the physical significance of the refractive index?
When a ray of light passes from air into water, does it bend towards or away from the normal?
A light ray in air strikes the surface of a transparent material at an angle of 60° to the normal and the angle of refraction is found to be 30°. Calculate the refractive index of the material.
A ray of light passes from medium X (refractive index 1.4) into medium Y (refractive index 2.1) at an angle of incidence of 40°. Calculate the angle of refraction in medium Y. (sin 40° = 0.643)
A ray of light passes through three different media in succession: air (n = 1.0), water (n = 1.33), and glass (n = 1.5). If the angle of incidence in air is 45°, calculate the final angle of refraction in glass. (sin 45° = 0.707)
A rectangular glass slab is placed on a piece of paper with a straight line drawn on it. When viewed from above at an angle, the line appears to be shifted. Explain the reason for this lateral shift and how it depends on the thickness and refractive index of the slab.
