When a compact disc is illuminated by small source of white light, coloured bands are observed. This is due to

dispersion

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diffraction

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interference

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reflection

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Solution

The correct option is B diffraction
The line rulings, each of 0.5 $μ$ m width, on a compact disc function as a diffraction grating. When a small source of light illuminates a disc, diffracted light forms coloured 'lanes' that are composite of the diffraction patterns from the ruling.

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When a compact disc is illuminated by small source of white light, coloured bands are observed. This is due to

The correct option is B diffractionThe line rulings, each of 0.5 μ m width, on a compact disc function as a diffraction grating. When a small source of light illuminates a disc, diffracted light forms coloured 'lanes' that are composite of the diffraction patterns from the ruling.

The correct option is B diffraction
The line rulings, each of 0.5 $μ$ m width, on a compact disc function as a diffraction grating. When a small source of light illuminates a disc, diffracted light forms coloured 'lanes' that are composite of the diffraction patterns from the ruling.