Question

A ray of light travels through a slab as shown in fig. The refactive index of material of slab varies as mew=1.2+x2/2 where 0less than x less than 1m. What is equivalent optical path of glass slab

Answer 1

In optics, optical path length or optical distance is the product of the geometric length of the path light follows through the system, and the index of refraction of the medium through which it propagates. In many textbooks, it is symbolically written as Λ.