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College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

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BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
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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