Estimate the width of the beam when it reaches the moon

Reference no: EM13660862

A laser beam passes during a slit of width1.0 cm and is pointed at the Moon, which is approximately380,000 {\rm km} from the Earth. Suppose the laser emits waves of wavelength 630 {\rm nm} (the red light of a He-Ne laser).

Estimate the width of the beam when it reaches the Moon.

Reference no: EM13660862

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