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A LASER is a source of very intense, monochromatic, and unidirectional beam of light. These properties of laser light can be exploited to measure long distances. The distance of the Moon from the Earth has been already determined very precisely using a laser as a source of light. A laser light beamed at the Moon takes 2.56 s to return after reflection at the Moon’s surface. How much Is the radius of the lunar orbit around the Earth? 

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Time for the laser reach the moon

= 1/2 × 2.56 s = 1.28 s

∴ Distance from the Earth to the moon

= 1.28 s × speed of light in vacuum = 1.28 × 3 × 108ms-1

= 3.84 × 108m

∴ The radius of the lunar orbit = 3.84 × 108m.

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