Two coherent monochromatic light beams of intensities I and 41 are superposed. The maximum and minimum possible intensities in the resulting beam are

Options

A. 51 and I
B. 5I and 3I
C. 9I and I
D. 9I and 3I

Answer

A, D

Explanation

`I_(max)=(sqrt(1+sqrt41))^(2)=91`
`I_(min)=(sqrt(1-sqrt41))^(2)=91`
`I_(max) : I_(min) = 9I : I`