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Light from a helium-neon laser (λ=633nm) passes through a circular aperture and is observed on a...

Light from a helium-neon laser (λ=633nm) passes through a circular aperture and is observed on a screen 4.0 m behind the aperture. The width of the central maximum is 2.5 cm .What is the diameter (in mm) of the hole?

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d= 633 nm y 125X10 m. Sİn θ= 1.221 siną small anga approxinatien dl dー 1.22 d D )-22x633x10×4.0 1.25 Xlo m 3 d = 0, 247 mm

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