Circular Aperture: Light of Wavelength 633 Nm from a He-Ne

question 49

Multiple Choice

Circular aperture: Light of wavelength 633 nm from a He-Ne laser passes through a circular aperture and is observed on a screen 4.0 m behind the aperture. The diameter of the central bright area is 5.4 cm. What is the diameter of the aperture?

• A) 110 μm
• B) 2.0 μm
• C) 6600 μm
• D) 960 μm

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