A laser beam passes through a slit of width 1.0 cm and
Chapter 35, Problem 35.72(choose chapter or problem)
A laser beam passes through a slit of width 1.0 cm and ispointed at the Moon, which is approximately 380,000 kmfrom the Earth. Assume the laser emits waves of wavelength633 nm (the red light of a He-Ne laser). Estimate thewidth of the beam when it reaches the Moon.
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