Question

considering relation between the first two terms of first pair complete the second
incident ray:rarer ray:__:denser medium​

Answer 1

Explanation:

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.

I think it's helpe you

Answer 2

Answer:

rarer medium : denser medium