Question

What is refractive index? What would happen when a ray of light passes from a :-
(a) rarer to a denser medium? (b) a denser medium to a rarer medium?
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Answer 1

Refraction is an effect that occurs when a light wave, incident at an angle away from the normal, passes a boundary from one medium into another in which there is a change in velocity of the light. ... Wave "a" passes the air/glass interface and slows down before b, c, or d arrive at the interface.

Answer 2

Answer:

Explanation:

he incident ray,the refracted ray and the normal to the refracting surface at the point of incidence lie in the same plane.

For a given pair of media and for a given colour of light the ration between the sine of angle of incidence to the sine of refraction is a constant.This constant is known as refractive index of the second medium with respect to the first medium.

When a ray of light passes through a glass slab, ∠i,∠r and the normal all lie in the same plane.

When a ray of light passes from one medium to another, here from air to glass or glass to air, the ratio  

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