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A LASER is a source of very intense, monochromatic and unidirectional beam of light. These properties of a 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 2.56s 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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Here $t=256 \mathrm{~s}, c=3 \times 10^8 \mathrm{~ms}^{-1}$
Radius of the lunar orbit around the earth $=$ Distance of the moon from the earth $=\frac{c \times t}{2}=\frac{3 \times 10^8 \times 2.56}{2}=3.84 \times 10^8 \mathrm{~m}$.
Radius of the lunar orbit around the earth $=$ Distance of the moon from the earth $=\frac{c \times t}{2}=\frac{3 \times 10^8 \times 2.56}{2}=3.84 \times 10^8 \mathrm{~m}$.
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