Question

when light ray passes from a densser medium to a lighter medium ts angle of refration is high . why doesnt red light follow this rule where its speed is high and is supposed to enter a new medium which is air however it refracts less than violet which is slower an which is supposed ( according to the rule) to refract less
hope you answer my Q

Answer 1

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When light enters from a rarer to an optically denser medium, it slows down and the new speed of propagation of light v' is given by, v' = v/n, where n is the refractive index of the denser medium wrt the first medium. Since medium is denser than the first medium n> 1, and so v'< v.

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Answer 2

Answer:

Laws of refraction;-

The 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

sinr

sini

=constant.

solution