Though quantum theroy of light can explain a number of phenomena observed with light, it is necessary to retain the wave-nature of light to explain the phenomena of:

Photoelectric effect

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Diffraction

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Compton effect

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Black body radiation

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Solution

The correct option is A Diffraction
Photoelectric effect, compton effect and blackbody radiation are explained by quantum theory of light, whereas diffraction, interference are explained by wave-nature of light.

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A light-ray can be thought to behave as______to explain the various phenomena such as reflection, interference etc.

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