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

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/ 11ef01a8_9a89_5713_bc85_e5705f2b0929_TB6585_11
B) dD/ $\lambda$
C) D $\lambda$ / 11ef01a8_9a89_5713_bc85_e5705f2b0929_TB6585_11
D) D $\lambda$ /d
E) 11ef01a8_9a89_5713_bc85_e5705f2b0929_TB6585_11 $\lambda$ / d