In Young's double slit experiment, the distance between two slits is made three times then the fringe width will becomes

Options

A. 9 times
B. 1/9 times
C. 3 times
D. 1/3 times

Answer

D

Explanation

Fringe width , `beta= (lambdaD)/(d)`
From question , `d' = 3d`
`therefore` New fringe width , `beta' = (lambda D)/(d')`
`therefore beta' = (lambda D)/(3d) = (beta)/(3)`