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NEET 2016 (Phase 2) · Superposition, Coherence & Intensity

Superposition, Coherence & Intensity question from NEET 2016 (Phase 2)

Q93NEET 2016 · PHASE 2Medium

Superposition, Coherence & Intensity

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

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Answer: (b)

$I_{max} - I_{min} = 4\sqrt{I_1 I_2}$ , $I_{max} + I_{min} = 2(I_1 + I_2)$
Ratio $= \frac{2\sqrt{I_1 I_2}}{I_1 + I_2}$ ; with $I_1 = nI_2$ :
$= \frac{2\sqrt{n}}{n+1}$
So the answer is (b) $\frac{2\sqrt{n}}{n+1}$ .

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