NEETPhysics-Wave Optics

NEET Physics Interference MCQ Question

Type: MCQ-conceptual-Medium-Class 12

The interference pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio ImaxIminImax+Imin\frac{I_{\text{max}} - I_{\text{min}}}{I_{\text{max}} + I_{\text{min}}} will be:

A

n(n+1)2\frac{\sqrt{n}}{(n+1)^2}

B

2n(n+1)2\frac{2\sqrt{n}}{(n+1)^2}

C

nn+1\frac{\sqrt{n}}{n+1}

D

2nn+1\frac{2\sqrt{n}}{n+1}

Correct Answer

Option D

Detailed Explanation

The contrast of the interference pattern is given by the visibility formula V=ImaxIminImax+IminV = \frac{I_{\text{max}} - I_{\text{min}}}{I_{\text{max}} + I_{\text{min}}}, which simplifies to 2nn+1\frac{2\sqrt{n}}{n+1} for intensity ratio n.

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