   Chapter 27, Problem 60PE

Chapter
Section
Textbook Problem

(a) What is the minimum angular spread of a 633-nm wavelength He-Ne laser beam that is originally 1.00 mm in diameter?(b) If this laser is aimed at a mountain cliff 15.0 km away, how big will the illuminated spot be?(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.) Explicitly show how you follow the steps in Problem-Solving Strategies for Wave Optics.

To determine

(a)

What is the minimum angular spread of a 633-nm wavelength He-Ne laser beam that is originally 1.00 mm in diameter?

Explanation

Given info:

λ=633nm=6.33×107mD=1mm=103m

Formula used:

Angle,

θ=1.22λD , λ is the wavelength and D is the diameter of the aperture, lens, mirror etc.

Calculation:

We have,

θ=1

To determine

(b)

How big will the illuminated spot be if this laser is aimed at a mountain cliff 15.0 km away?

To determine

(c)

How big a spot would be illuminated on the Moon, neglecting atmospheric effects?

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