Light of wavelength 560 nm goes through a pinhole of diameter 0.20 mm and falls on a wall at a distance of 200 m. What will be the radius of the central bright spot formed on the wall?

Given,
Pinhole diameter,

Distance of the wall,

therefore, Radius of the central spot,

so diameter is

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Question

Light of wavelength 560 nm goes through a pinhole of diameter 0.20 mm and falls on a wall at a distance of 200 m. What will be the radius of the central bright spot formed on the wall?

Philoid · Accepted Answer

Given,

Pinhole diameter,

Distance of the wall,

therefore, Radius of the central spot,

so diameter is