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What is the cause of diffraction?

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in Physics – Class 12 by (135k points)
What is the cause of diffraction?

(a) Interference of primary wavelets

(b) Interference of secondary wavelets

(c) Reflection of primary wavelets

(d) Reflection of secondary wavelets

The question was asked in semester exam.

The origin of the question is Wave Optics in portion Wave Optics of Physics – Class 12

1 Answer

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Correct option is (b) Interference of secondary wavelets

For explanation: Diffraction occurs due to interference of secondary wavelets between different portions of a wavefront allowed to pass across a small aperture or obstacle. Interference can be either constructive or destructive. When interference is constructive, the intensity of the wave will increase.

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