Question

Using a monochromatic light of wavelength 2 in Young’s double-slit experiment, the eleventh dark fringe is obtained on the screen for a phase difference of

(A) \(\cfrac{11}2\) π rad 

(B) \(\cfrac{21}2\) π rad 

(C) 13 π rad 

(D) 21 π rad

Answer 1

Correct option is (D) 21 π rad