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JEE Main 2021 (25 Feb, Shift 1) · Superposition, Coherence & Intensity

Superposition, Coherence & Intensity question from JEE Main 2021 (25 Feb, Shift 1)

Q77JEE Main 2021 · 25 FEB · SHIFT 1Medium

Superposition, Coherence & Intensity

Two coherent light sources having intensity in the ratio 2x produce an interference pattern. The ratio $\frac{I_{\max} - I_{\min}}{I_{\max} + I_{\min}}$ will be:

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Answer: (a)

$\frac{I_{max}-I_{min}}{I_{max}+I_{min}} = \frac{4\sqrt{I_1 I_2}}{2(I_1+I_2)} = \frac{2\sqrt{I_1 I_2}}{I_1 + I_2}$
With $I_1 = 2x\,I_2$ : $= \frac{2\sqrt{2x}}{2x+1}$
So the answer is (a) $\frac{2\sqrt{2x}}{2x+1}$ .

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