A beam of polarized light with an average intensity of 14.5 W/m² is sent through a polarizer. The transmission axis makes an angle of 25.0°

Question

A beam of polarized light with an average intensity of 14.5 W/m² is sent through a polarizer. The transmission axis makes an angle of 25.0° with respect to the direction of polarization. Determine the rms value of the magnetic field of the transmitted beam.

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Ngọc Diệp 5 years 2021-08-22T03:53:14+00:00 1 Answers 19 views 0

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  1. Dulcie
    0
    2021-08-22T03:54:49+00:00
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    Answer:

    Explanation:

    Intensity, Io = 14.5 W/m²

    θ = 25°

    By the law of Malus

    I = I_{o}Cos^{2}\theta

    I = 14.5Cos^{2}25

    I = 11.91 W/m²

    Now the formula for the rms value of magnetic field is given by

    I = \frac{cB_{rms}^{2}}{\mu _{0}}

    B_{rms}^{2}=\frac{11.91\times 4\times 31.4\times 10^{-7}}{3\times 10^{8}}

    Brms = 2.23 x 10^-7 tesla

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