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How long will the beam take to make the round trip?

Posted on September 22, 2022 by Shady

FIber Optic
Please show your work clearly in PDF file.
Compute the spot size on the moon of an Earth based collimated Gaussian shaped beam whose wavelength is 0.8um and whose spot size equals 8mm.How long will the beam take to make the round trip?
1 mile = 1609m. D=238,900 miles (distance between the earth and the moon)
Electrical Engineering

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