In Young's double slit interference experiment, the slit separation is made 3 fold. The fringe width becomes

Options

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

Answer

A

Explanation

The slite spearation is made 3 fod i.e, increases by 3 times i.e, `d_(2)=3d_(1)`
`beta_(1) (D)/(d_(1)) lambda and beta_(2)(D)/(d_(2)) lambda`
`(beta_(2))/(beta_(1))=(d_(1))/(d_(2))=(d_(1))/( 3d_(1))=(1)/(3)`
`:. beta_(2)=(1)/(3)beta_(1) =(1)/(3)` times