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:
B) dD/$\lambda$
D) D$\lambda$/d

Question

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:
B) dD/$\lambda$ 
D) D$\lambda$/d

Quizplus · Accepted Answer

The Answer of 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:
B) dD/$\lambda$ 
D) D$\lambda$/d

A Diffraction-Limited Laser of Length and Aperture Diameter D λ\lambdaλ

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