A ruby laser beam ($\lambda$= 694.3 nm)is sent outwards from a 2.7-m diameter telescope to the moon,384,000 km away.What is the radius of the big red spot on the moon?
A)500 m
B)250 m
C)120 m
D)1.0 km
E)2.7 km

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The Answer of A ruby laser beam ($\lambda$= 694.3 nm)is sent outwards from a 2.7-m diameter telescope to the moon,384,000 km away.What is the radius of the big red spot on the moon?
A)500 m
B)250 m
C)120 m
D)1.0 km
E)2.7 km

A Ruby Laser Beam λ\lambdaλ = 6943 Nm)is Sent Outwards from a 2

A Ruby Laser Beam $\lambda$ = 6943 Nm)is Sent Outwards from a 2