First slide

Diffraction of light-Wave Optics

Question

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

Easy

A

dispersion
B

diffraction
C

interference
D

polarization

Solution

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
the composite of the diffraction patterns from the ruling.

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