Question

The intensity of light emerging from one slit in a Young’s double-slit interference set up is four times that of the other. The ratio of maximum intensity of minimum intensity in the fringe pattern is: 

(a)  4 : 1 

(b)  2 : 1 

(c)  9 : 1 

(d)  3 : 1 

Answer 1

Correct option  (c) 9 : 1 

Explanation:

If  a₁ and  a₂ are amplitudes of two rays, then the ratio of maximum intensity to the minimum intensity in the fringe pattern is given as