Question

How does the velocity of light vary with change in the optical density of the media?

Absolute refractive indices of medium 'A' and medium 'B'are 'na' and 'nb' respectively. What is the
refractive index of medium 'B' concerning medium 'A'?

A concave lens made up of a material of refractive index n1 is kept in a medium of refractive index n2. A parallel beam of light is incident on the lens. Trace the path of rays of light parallel to principal axis incident
on the concave lens after refraction when:
(i)n1>n2 (ii)n1=n2
​

Answer 1

Answer:

Absolute refractive indices of medium 'A' and medium 'B' are 'n a' and 'n b', respectively. ... This means that light travels slower, in a medium with high optical density. Speed of light slows down in a optically denser because light interacts with the matter inside the denser medium.

Answer 2

Answer:

As the optical density increases the speed of light in that medium decreases and hence the ratio of speed of light in air to the speed of light in the medium increases therefore the refractive index increases.

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