The length of the optical path of two media in contact of length `d_(1)` and `d_(2)` of refreactive indices `mu_(1)` and `mu_(2)` respectively, is

The length of the optical path of two media in contact of length d_(1) and d_(2) of refractive indices mu_(1) and mu_(2) respectively, is

A hollow double concave lens is made of very thin transparent material. It can be filled with air or either of two liquid L_(1) and L_(2) having refractive indices mu_(1) and mu_(2) respectively (mu_(2)gtmu_(1)gt1) . The lens will diverge a parallel beam of light if it is filled with

Speed of light through two media of refractive indices mu_(1) and mu_(2) are u_(1) and u_(2) respectively, then

In Young's double slit experiment S_(1) and S_(2) are two slits. Films of thickness t_(1) and t_(2) and refractive indices mu_(1) and mu_(2) are placed in front of S_(1) and S_(2) respectively. If mu_(1)t_(1) = mu_(2)t_(2) , then the central maximum will :

If a ray of light takes t_(1) and t_(2) times in two media of absolute refractive indices mu_(1) and mu_(2) respectively to travel same distance, then