Question

If a1 and a2 are the amplitudes of light coming from two slits in Young's double slit
experiment, then the maximum intensity of interference fringe is
a) (a1+a2)
b)2(a1+a2)
c) (a1+a2)²
d) (a1-a2)²
​

Answer 1

The maximum intensity of the interference fringe is (a₁+ a₂)².  

Explanation:

• To produce two coherent light sources, the best method is to use a monochromatic source to illuminate a barrier containing two small openings.
• The schematic diagram of Young's double-slit experiment is shown below.
• The lights from S₁ and S₂ produces a pattern of bright and dark parallel bands on a viewing screen called fringes.
• For a₁ and a₂ are the amplitudes of the light coming out of the slits, then the maximum intensity of interface fringes = (a₁+ a₂)² and the minimum intensity of interface fringes = (a₁- a₂)².