First slide

Diffraction

Question

A small circular disc is placed in the path of light from a distant source. Identify the nature of the fringe produced.

Easy

A

Dual
B

Narrow
C

Dark
D

Bright

Solution

Waves from the distant source are diffracted by the edge of the disc. These diffracted waves interfere constructively at the center of the shadow and produce a bright fringe. Therefore, the nature of the fringe produced is bright.

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