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A wave of light having frequency 4 xx 10...

A wave of light having frequency `4 xx 10^(14)`Hz. And speed of light `3 xx 10^8` m/s enters glass of R.I. 1.5. Change in wavelength is

A

`2.5 xx 10^(-6)` m

B

`2.5 xx 10^(-7)` m

C

`2.5 xx 10^(-8) ` m

D

`2.5 xx 10^(-9)` m

Text Solution

Verified by Experts

The correct Answer is:
B
`lambda_(a) = (V_(a))/(n) = (3 xx 10^(8))/(4 xx 10^(14)) = 7.5 xx 10^(-7) m`
and `lambda_(g) = (lambda_(a))/(1.5) = 5 xx 10^(-7)` m
`therefore ` Change in wavelength = `2.5 xx 10^(-7)` m
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