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A small circular disc is placed in the path of light from a distant source. Identify the nature of the fringe produced.(a) Dual(b) Narrow(c) Dark(d) BrightThis question was posed to me in final exam.Question is from Wave Optics in section Wave Optics of Physics – Class 12

Answer»

Correct choice is (d) Bright

Explanation: 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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