A ray of light (f = 5.09 x 1014 Hz) is incident on the boundary between air and an unknown material X at an angle of incidence of 550, as sh

Question

A ray of light (f = 5.09 x 1014 Hz) is incident on the boundary between air and an unknown material X at an angle of incidence of 550, as shown below. The absolute index of refraction (n) of material X is 1.66
A)Using the given information, identify a substance of which material X may be composed.
B)Using the given information, determine the speed of this ray of light in material X.
C)Using the given information, calculate the angle of refraction of the ray of light in material X.

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niczorrrr 4 years 2021-07-30T23:19:04+00:00 1 Answers 168 views 0

Answers ( )

  1. giabao
    0
    2021-07-30T23:20:19+00:00
    Reply

    Answer:

    A) Material X is flint glass

    B) Speed of light in the X material is 1.807 x 10^{8} m/s

    C) Angle of refraction of light in medium X is 29.57^{o}

    Explanation:

    Given data:

    frequency of the light f = 5.09 x 10^{14} Hz

    angle of incidence Θ_{i} = 55^{o}

    index of refraction of material n_{2} = 1.66

    A) To find material X

    Given the index of refraction is 1.66 and hence the material is the flint glass

    B) To calculate the speed of light in the material.

    We know that the relation between index of refraction (n), velocity of light (c = 3 x 10^{8} m/s) and velocity of light is given by the equation:

    n = c/v

    Hence,

    Speed of light in the X material v = c/n

                                                              = \frac{3 x 10^{8} }{1.66}

                                                              = 1.807 x 10^{8} m/s

    C) To calculate angle of refraction of light in medium X

    We know that the Snell’s law states that

                           n_{1} sin Θ_{i}  = n_{2} sin Θ_{r}

    n_{1} = incident index

    n_{2}  = refracted index

    Θ_{i} = incident angle

    Θ_{r} = refracted angle

    In given problem, n_{1} = 1 since medium is air

    Substituting the known values, we get

    1 x  sin 55^{o}  = 1.66 x sin Θ_{r}

    sin Θ_{r} = sin 55^{o} /1.66

               = 0.4935

    Hence, angle of refraction of light in medium X Θ_{r} = sin^{-1} (0.4935)

                                                                                           = 29.57^{o}

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