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13 January, 05:50

A beam of unpolarized light in air strikes a flat piece of glass at an angle of incidence of 54.2 degrees. If the reflected beam is completely polarized, what is the index of refraction of the glass?

A. 1.60

B. 1.39

C. 1.52

D. 2.48

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Answers (2)
  1. 13 January, 07:51
    0
    1.386

    Explanation:

    Angle of incidence, i = 54.2°

    Let n be the refractive index of glass.

    According to the Brewster's law

    n = tan ip

    where, ip is the polarising angle.

    n = tan 54.2°

    n = 1.386

    Thus, the refractive index of glass is 1.386.
  2. 13 January, 08:46
    0
    correct option is B. 1.39

    Explanation:

    given data

    angle of incidence (θ) = 54.2 degrees

    to find out

    index of refraction of the glass

    solution

    we know that here reflected beam is completely polarized

    so angle of incidence = angle of polarized ... 1

    for reflective index we apply here Brewster law that is

    μ = tan (θ) ... 2

    put here θ value we get

    μ = tan (54.2)

    μ = 1.386

    so correct option is B. 1.39
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