Question

The width of fringe is 2 mm on the screen in a double slits experiment for the light of wavelength of 400 nm. The width of the fringe for the light of wavelength 600 nm will be

(1) 4 mm 

(2) 1.33 mm 

(3) 3 mm 

(4) 2 mm

Answer 1

Correct option is (3) 3 mm