A laser beam passes through a slit of width 1.0 cm and is pointed at the Moon,
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A laser beam passes through a slit of width 1.0 cm and is pointed at the Moon, which is approximately 380,000 km from the Earth. Assume the laser emits waves of wavelength 633 nm (the red light of a He-Ne laser). Estimate the width of the beam when it reaches the Moon due to diffraction.
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We first find the angular halfwidth for the first order using Eq 243a Sin...View the full answer
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