The beam from a laser is focused with a lens, reducing the area of the beam by a factor of 2. By what factor does the amplitude of the electric field increase?A. The amplitude does not change.B. The amplitude increases by a factor of √2.C. The amplitude increases by a factor of 2.D. The amplitude increases by a factor of 2√2.E. The amplitude increases by a factor of 4.
The beam from a laser is focused with a lens, reducing the area of the beam by a factor of 2. By what factor does the amplitude of the electric field increase?A. The amplitude does not change.B. The amplitude increases by a factor of √2.C. The amplitude increases by a factor of 2.D. The amplitude increases by a factor of 2√2.E. The amplitude increases by a factor of 4.
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter24: Electromagnetic Waves
Section: Chapter Questions
Problem 51P
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The beam from a laser is focused with a lens, reducing the area of the beam by a factor of 2. By what factor does the amplitude of the electric field increase?
A. The amplitude does not change.
B. The amplitude increases by a factor of √2.
C. The amplitude increases by a factor of 2.
D. The amplitude increases by a factor of 2√2.
E. The amplitude increases by a factor of 4.
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