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Question

A convex lens of diameter 8.0 cm is used to focus a parallel bam of light of wavelength 620 nm. If the light be focused at a distance of 20 cm from the lens, what would be th eradius of the central bright spot formed?

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Solution

λ=620nm=620×109m,D=20cm=20×102m,d=8cm=8×102mR=1.22×620×109×20×1028×102=1891×109=1.9×106m
So, Diameter =2R=3.8×106


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