A high-powered laser beam (λ = 600 nm) with a beam diameter of 12 cm is aimed at the Moon, 3.8 x 105 km distant. The beam spreads only because of diffraction. The angular location of the edge of the central diffraction disk (see Eq. 36-12) is given by

Where d is the diameter of the beam aperture. What is the diameter of the central diffraction disk on the Moon's surface?

Transcribed Image Text:

sin θ-1.22A