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NEET 2015 (AIPMT) · Superposition, Coherence & Intensity

Superposition, Coherence & Intensity question from NEET 2015 (AIPMT)

Q94NEET 2015 · AIPMTMedium

Superposition, Coherence & Intensity

Two slits in Young's experiment have widths in the ratio 1: 25. The ratio of intensity at the maxima and minima in the interference pattern, $\frac{I_{max}}{I_{min}}$ is

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Answer: (c)

Intensity $\propto$ width: $I_1 : I_2 = 1 : 25$ , so amplitudes $1 : 5$ .
$\frac{I_{max}}{I_{min}} = \left(\frac{5+1}{5-1}\right)^2 = \frac{36}{16} = \frac{9}{4}$
So the answer is (c) $\frac{9}{4}$ .

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