A Diffraction-Limited Laser of Length and Aperture Diameter D $\lambda$

question 29

Multiple Choice

A diffraction-limited laser of length and aperture diameter d generates light of wavelength $\lambda$ .If the beam is directed at the surface of the Moon a distance D away, the radius of the illuminated area on the moon is approximately:

• A)dD/
• B)dD/\(\lambda\)
• C)D\(\lambda\) /
• D)D\(\lambda\)/d
• E)\(\lambda\)/ d

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