Home Physics Wave Optics Karnataka - CET Previous Year Question When a Compact Disc (CD) is illuminated by s…
Physics Wave Optics Karnataka - CET Previous Year Question MCQ (Single Correct)

When a Compact Disc (CD) is illuminated by small source of white light, coloured bands are observed. This is due to

A
interference
B
scattering
C
reflection
D
diffraction.

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The correct answer is:
D

: A compact disc (CD) contains many fine circular lines on it which acts as the diffraction grating. When the disc is illuminated by white light, different colours are observed as a result of diffraction of light at different angles.

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