Q .     A glass slab of thickness `4 cm` contains the same numbers of waves as `5 cm` of water when both are traversed by the same monochromatic ray of light. The refractive index of water is `\frac{4}{3}`, what is that for glass?

MHCET 2011
A

`\frac{5}{3}`

B

`\frac{5}{4}`

C

`\frac{16}{15}`

D

`\frac{3}{2}`

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