Question

In the Young's double slit experiment, the intensity of light at a point on the screen where the path difference λ  is K, λ/4  being the wavelength of light used). The intensity at a point where the path difference is λ/4 will be

(a) K 

(b) K/4

 (c) K/2 

(d) zero

Answer 1

Correct option  (c) K/2 

Explanation:

Intensity at any point on the screen is

where I₀ is the intensity of either wave and ϕ is the phase difference between two waves.