NEET Physics Interference MCQ Question
Which of the following statements about interference in wave optics is correct?
Constructive interference occurs when the path difference is an integer multiple of the wavelength.
Destructive interference occurs only when the path difference is equal to half the wavelength.
Interference patterns can be observed with incoherent light sources.
The intensity of light due to two coherent sources is proportional to the sum of their individual intensities.
Correct Answer
Detailed Explanation
Constructive interference occurs when the path difference is equal to nλ (where n is an integer), resulting in maximum intensity. Destructive interference occurs when the path difference is (n + 1/2)λ, leading to cancellation of the light waves at certain points. Incoherent sources do not maintain a fixed phase relationship, so they do not produce observable interference patterns.
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