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When the same monochromatic ray of ligh...

When the same monochromatic ray of light travels through glass slab and through water, the number of waves in glass slab of thickness 6 cm is same as in water column of height 7 cm. If refractive index of glass is `1.5`, then refractive index of water is

A

1.258

B

1.269

C

1.286

D

1.31

Text Solution

Verified by Experts

The correct Answer is:
C
No. of waves is glass slab =No. of waves in water column.
`therefore mu_(g). H_(g) =mu_(w). H_(w)`
`therefore mu_(w)=(mu_(g).h_(g))/(hw)=(1.5 xx 6)/(7)`
`therefore mu_(w)=9/7=1.286`
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