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physics problem

Consider light from a helium-neon laser (lambda = 632.8 nanometers) striking a pinhole with a diameter of 0.385 mm.

What is the angular radius theta_1 of the firstdark ring for a point source being imaged by this telescope? Use 550 nanometers for the wavelength, since this is near the average for visible light.
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Answer #1
wavelength λ = 632.8 nm= 632.8 * 10-9 mDiameter of the pin hole d = 0.385 mm=0.385 * 10 -3 ma,
sinθ1=1.22λ/d =1.22*632.8*10^-9/0.385*10^-3
=>θ1=0.1148 degrees
b,
sinθ1=1.22λ/D=1.22*550*10^-9/0.385*10^-3
=>θ1=0.09985 degrees
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