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Diffraction spreading for a flashlight is insignificant compared with other limitations in its optics, such as...

Diffraction spreading for a flashlight is insignificant compared with other limitations in its optics, such as spherical aberrations in its mirror. To show this, calculate the minimum angular spreading of a flashlight beam that is originally 5.15 cm in diameter with an average wavelength of 600 nm.

?=rad

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according to the Rayleigh Criterion the minimum angular spreading, for a circular aperture, is

then,

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