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18 May, 11:08

If the light leaves a glass block (n = 1.5) with an angle of refraction of 70°. what is the angle of incidence?

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  1. 18 May, 14:26
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    The angle of incidence is 38.8°.

    Explanation:

    let n1 = 1.5 be the refractive index of glass and ∅1 be the angle of incidence, let n2 be the refractive index of air and ∅2 be the angle of refraction.

    by Snell's law:

    n1*sin (∅1) = n2*sin (∅2)

    sin (∅1) = n2*sin (∅2) / n1

    = (1) * sin (70) / 1.5

    ∅1 = 38.8°

    Therefore, the angle of incidence is 38.8°.
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