Let `S_(1)` and `S_(2)` be the two slits in Young's double-slit experiment. If central maxima is observed at P and angle `/_ S_(1) P S_(2) = theta`, then fringe width for the light of wavelength `lambda` will be

Options

A. `lambda // theta`
B. `lambda theta`
C. `2 lambda // theta`
D. `lambda // 2 theta`

Answer

a

Explanation

`((d//2))/(D) = (theta)/(2) implies theta = (d)/(D)` and `beta = (D lambda)/(d) = (lambda)/(theta)`