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A beam of laser light with a wavelength of ?=475.00 nm passes through a circular aperture...

A beam of laser light with a wavelength of ?=475.00 nm passes through a circular aperture of diameter ?=0.113 mm . What is the angular width of the central diffraction maximum formed on a screen? ?=

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Answer #1

Sin theta = 1.22 × lamda÷ D

Or theta = sin^(-1) (1.22×4.75×10^(-7)÷1.13×10^(-4))

Or theta = 0.2938°

Now angular width = 2×theta = 0.5876°

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