When a compact disc is illuminated by a source of white light, coloured lines are observed. This is due to
Question and options
When a compact disc is illuminated by a source of white light, coloured lines are observed. This is due to
- Dispersion
- Diffraction
- Polarisation
- Refraction
Answer and explanation
Correct answer: B - Diffraction
The closely spaced tracks of a CD act as a reflection diffraction grating that splits white light into colours, so the effect is diffraction. Dispersion and refraction need a transparent medium, and polarisation does not separate colours.
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