A glass slab of thickness 8 cms contains...

A glass slab of thickness 8 cms contains the same number of waves as 10 cms long path of water when both are traversed by the same monochromatic light. If the refractive index of water is 4/3, the refractive index of glass is

`5/3`

`5/4`

`16/15`

`3/2`

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