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The refractive index of a piece of glass...

The refractive index of a piece of glass of `1.5`and it acomodates as many waves as are accomodated in`18cm` width of water column.If the refractive index of water `1.33`then the thickness of glass piece will be-

A

`20cm`

B

`10cm`

C

`12cm`

D

`16cm`

Text Solution

Verified by Experts

The correct Answer is:
4
`n_(glass)=1.5`
`N_(water)=1.33`
`t_(water)=18cm`
`t_(glass)=?`
`:.n_(glass)t_(glass)=n_(water)t_(water)…….(1)`
Fromeqs.(1)and(2) …….. (2)
`t_(glass)=(1.33xx18)/(1.5)=16cm`
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