Question

The interference pattern is obtained with two coherent light sources of intensity ratio 4 : 1. And the ratio

$\frac{l_{max}+l_{min}}{l_{max}-l_{min} }$

is 5/x. Then, the value of x will be equal to:

• A. 3
• B. 4
• C. 2
• D. 1

Answer 1

Answer: (A)

3

Answer 2

The correct option is(B): 4.

=$(\frac{\frac{l_1}{l_2}+1}{2\sqrt\frac{l_1}{l_2}})=\frac{4+1}{2×2}$

=$\frac{5}{4}$

So

x=4.