If two sources emit light waves of different amplitudes then (a) brightness of fringes is less. (b) fringes disappear after short time. (c) fringe width is less. (d) there is some intensity of light in the region of destructive interference.

Answer: (d). At destructive interference the resultant amplitude is |A₁ - A₂|. If A₁ ≠ A₂, this is not zero, so some light is present in the dark regions. So the answer is (d).

If two sources emit light waves of different amplitudes then | MHT CET 2021 (22 Sep, Shift 2)

Q74MHT CET 2021 · 22 SEP · SHIFT 2Easy

Superposition, Coherence & Intensity

If two sources emit light waves of different amplitudes then

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Answer: (d)

At destructive interference the resultant amplitude is $|A_1 - A_2|$ .
If $A_1 \ne A_2$ , this is not zero, so some light is present in the dark regions.
So the answer is (d).

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