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Wave Optics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsWave Optics1 Mark
Question
Assertion : For best contrast between maxima and minima in the interference pattern of Young's double slit experiment, the intensity of light emerging out of the two slits should be equal.
Reason: The intensity of interference pattern is proportional to square of amplitude.
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Answer

(b) When intensity of light emerging from two slits is equal, the intensity at minima,$I_{\min }=\left(\sqrt{I_a}-\sqrt{I_b}\right)^2=0$, or absolute dark.It provides a better contrast.

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