At what angle should the axes of two Polaroids be placed so as to reduce the intensity of the incident unpolarized light to (a) (1/3), (b) (

Question

At what angle should the axes of two Polaroids be placed so as to reduce the intensity of the incident unpolarized light to (a) (1/3), (b) (1/10)

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Thành Đạt 3 months 2021-08-15T08:27:30+00:00 1 Answers 14 views 0

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    2021-08-15T08:28:33+00:00

    Answer:

    35.3°

    18.4°

    Explanation:

    a.

    The first polariser polarises the unpolarised light reducing its intensity from I0 to I0/2. We have to reduce the intensity from I0/2 to I0/3.

    Using to Law of Malus, I=I0cos²θ

    cos²θ=I/I0=(I0/3)/I0/2 ,

    cosθ=√2/3−−√=0.6667−−−−−√=0.8165

    θ=cos−1(0.8165)=35.3∘

    B.

    Cos²θ=I/Io =Io/10/Io9

    Cosθ= √9/10= 0.9487

    = cos−10.9487

    =18.4°

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