Question

(a) What is the minimum angular spread (in rad) of a 694 nm wavelength ruby laser beam that is originally 1.17 mm in diameter? 7.24*10**-4 rad (b) If this laser is aimed at a mountain cliff 15.5 km away, how big will the illuminated spot be? (Give the diameter of the spot in meters.) m (c) How big a spot would be illuminated on the Moon, neglecting atmospheric effects? (This might be done to hit a corner reflector to measure the round-trip time and, hence, distance. Assume the distance from the surface of the Earth to the surface of the Moon is 3.82 x 108 m. Give the diameter of the spot in kilometers.) km Explicitly show how you follow the steps in Problem-solving Strategies for Wave Optics. (Submit a file with a maximum size of 1 MB.) Choose File No file chosen This answer has not been graded yet. Additional Materials

(a)

What is the minimum angular spread (in rad) of a 694 nm wavelength ruby laser beam that is originally 1.17 mm in diameter?

________ rad

(b)

If this laser is aimed at a mountain cliff 15.5 km away, how big will the illuminated spot be? (Give the diameter of the spot in meters.)

_________ m

(c)

How big a spot would be illuminated on the Moon, neglecting atmospheric effects? (This might be done to hit a corner reflector to measure the round-trip time and, hence, distance. Assume the distance from the surface of the Earth to the surface of the Moon is 3.82 ✕ 10⁸ m. Give the diameter of the spot in kilometers.)

_______________ km

Explicitly show how you follow the steps in Problem-Solving Strategies for Wave Optics. (Submit a file with a maximum size of 1 MB.)

Answer 1