Light long 5

Question 1

When can we say that a medium is optically denser than the other?

Answer 1

In comparing two media, the one with the larger refractive index is optically denser medium than the other. The other medium of lower refractive index is optically rarer. The speed of light is higher in a rarer medium than a denser medium.

Question 2

What are the laws of reflection ?

Answer 2

(i) The angle of incidence is equal to the angle of reflection
(ii) The incident ray, the normal and the reflected ray, all lie in the same plane.