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What should be wavelength of light to ge...

What should be wavelength of light to get `5^(th)` bright fringe at a point where 3rd bright fringe is obtained using wavelength 700 nm in Young's experiment?

A

420 nm

B

500 nm

C

750 nm

D

630 nm

Text Solution

Verified by Experts

The correct Answer is:
A
`n_(1) lambda_(1)= n_(2) lambda_(2)`
`:. Lambda_(2)=lambda_(1)xx(n_(1))/(n_(2))`
`=700xx(3)/(5)=140xx3=420` nm
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