A convex lens of diameter 8.0 cm is used to focus a parallel beam of light of wavelength 620 nm.

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asked Mar 31, 2018 in Physics by rubby (7,550 points) 1 3 5

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

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answered Mar 31, 2018 by Nisa (2,540 points) 1 3

So, diameter = 2R = 3.8 x10–6 m

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