Two monochromatic light beams of intensity 16 and 9 units are interfering. The ratio of intensities of bright and dark parts of the resultant pattern is:

Step-by-step solution

Intensity ( amplitude )^2 aligned & I₁ I₂ = 16 9 = a₁^2 a₂^2 & a ₁=4 ; a ₂=3 aligned Therefore the ratio of intensities of bright and dark parts I_ Bright I_ Dark = (a₁+a₂ )^2 (a₁-a₂ )^2 = (4+3)^2 (4-3)^2 = 49 1