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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 waveletsThe question was asked in semester exam.The origin of the question is Wave Optics in portion Wave Optics of Physics – Class 12

Answer»

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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