What phenomenon of light is responsible for multicolored appearance of a Compact Disc (CD) ?

Reflection

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Refraction

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Dispersion

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Diffraction

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Solution

The correct option is D Diffraction
A CD is made up of thousands of pits arranged in the form of spiral tracks. When visible light is incident on the pits, each pit diffracts light in all directions. Here CD acts as a diffraction grating (diffraction – change in direction and intensities of waves after passing through a narrow slits or edges).

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