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Violet light refraction from air to glass

  1. May 11, 2014 #1
    A ray of violet light enters a 60° glass prism at an angle of incidence of 40°. If the refractive
    index of the prism material for violet light is 1.651


    (a) The angle of refraction for the air-glass boundary

    (b) The critical angle for violet leaving the glass

    (c) The velocity of the violet light in the prism

    any help would be great.

    at the moment im on a)

    i know that n=sin(i°)/sin(r°)

    the wavelength of light is n=λair/λmedium( violet light)
    = 1/1.651 = 0.6

    sin(r)=sin(60)/0.6 = 1.4 but when i try to get the angle i get nothing.
  2. jcsd
  3. May 11, 2014 #2


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    Staff: Mentor

    n is larger than 1, so sin(r°) has to be smaller than sin(i°).
    Why did you take the inverse of n in your calculation?
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