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Chapter 31: Q. 27 (page 902)

A200mWvertically polarized laser beam passes through a polarizing filter whose axis is 35掳 from horizontal. What is the power of the laser beam as it emerges from the filter?

Short Answer

Expert verified

The power of the laser beam is65.8mw.

Step by step solution

01

Formula for power of laser beam

When unpolarized light strikes a polarizer, the power of the polarised light that emerges is half that of the unpolarized light.

Incident light that isn't polarised.

So,

P=P0cos2胃

Where,

role="math" localid="1648929202807" P0-Vertically polarized laser beam

P-Power of laser beam

02

Figure for laser beam with axis of 35°

Figure is,

03

Calculation for power of laser beam

The beam angle is,

胃=90掳-35掳

=55掳

The beam's power is determined as follows:

P=P0cos2胃

=200mW脳cos255掳

P鈮�65.8mW

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