Question

A double slit arrangement produces fringes for light `lambda=5890Å` which are `0.2^@` apart. If the whole arrangement is fully dipped in a liquid of `mu=4/3`, the angular fringes separation is
A. (a) `0.15^@`
B. (b) `0.30^@`
C. (c) `0.10^@`
D. (d) `0.25^@`

Answer 1

Correct Answer - A
New wavelength is `3/4` times the old wavelength. So, the new angular separation is `3/4xx0.2^@` or `0.15^@`.