Chapter 31: Q. 27 (page 902)

A $200 mW$ vertically polarized laser beam passes through a polarizing filter whose axis is $35 °$ 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 is $65.8 mw$ .

Step by step solution

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,

$P = P_{0} \cos^{2} (θ)$

Where,

role="math" localid="1648929202807" $P_{0}$ -Vertically polarized laser beam

$P$ -Power of laser beam

Figure for laser beam with axis of 35°

Figure is,

Calculation for power of laser beam

The beam angle is,

$θ = 90^{°} - 35^{°}$

$= 55^{°}$

The beam's power is determined as follows:

$P = P_{0} \cos^{2} (θ)$

$= 200 mW \times \cos^{2} (55^{°})$

$P \approx 65.8 mW$

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A $200 mW$ vertically polarized laser beam passes through a polarizing filter whose axis is $35 °$ from horizontal. What is the power of the laser beam as it emerges from the filter?

Short Answer

Step by step solution

Formula for power of laser beam

Figure for laser beam with axis of 35°

Calculation for power of laser beam

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

Short Answer

Step by step solution

Formula for power of laser beam

Figure for laser beam with axis of 35°

Calculation for power of laser beam

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Physics Textbooks

Work Energy and Power

Measurements

Physics of Motion

Oscillations

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Electromagnetism

Study anywhere. Anytime. Across all devices.

A $200 mW$ vertically polarized laser beam passes through a polarizing filter whose axis is $35 °$ from horizontal. What is the power of the laser beam as it emerges from the filter?