A glass slab of thickness `4 cm` contains the same number of waves as `5 cm` of water, when both are traversed by the same monochromatic light. If the refractive index of water is `4//3,` then refractive index of glass is

Options

A. `5/3`
B. `5/4`
C. `16/15`
D. `3/2`

Answer

A

Explanation

(a) `because` Refractive index of water with respect to air, `""_(a)n_(w)=4/3`
and Refarctive index of glass with respect to water, `""_(a)n_(g)=""_(a)n_(w)xx""_(w)n_(g)=4/3xx10/8=5/3`