Worksheet 3: Snell's Law.
Refraction through a lens.

Snell's Law

Please write one or two sentences for each of the following words or phrases.

  1. What happens when a ray of light travels from air into a transparent medium?


    2. .
  2. What happens when a ray of light travels from a transparent medium into air?


    3. .
  3. What does the critical angle of a material mean?


    4. .
  4. What happens if a ray of light attempts to leave a diamond (n = 2.45) at an angle of incidence greater than 24, which is the critical angle for diamond in air?.


    5. .
  5. A ray is incident on a material with an index of 1.50 at an angle of 56 degrees to the normal. If the ray is traveling from air, what is the angle of refraction?

    6. (Round to nearest degree.)
    .
    What is the speed of light in miles/second in this material?
    (Round to thousandths.)
    .
  6. A ray of light exits from a material with index of 1.80, traveling into air. If the angle of refraction is 20 degrees, what was the original angle of incidence?

    7. (Round to nearest degree.)
    .
    What is the angle of deviation?
    (Round to nearest degree.)
    .
    What is the speed of light in miles/second in this material?
    (Round to thousandths.)
    .
  7. If a ray of light travels from air into a transparent material at a 26 degree angle to the normal to the surface, and it is refracted through an angle of 16 degrees, what is the index of refraction of the unknown material?

    8. (Round to two decimal places.)
    .
    What is the angle of deviation?
    (Round to nearest degree.)
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Textbooks:
Brooks & Borish, Systems for Ophthalmic Dispensing, 2nd Ed, Butterworth-Heinemann, 1996
Stoner, Optical Formulas Tutorial, Butterworth-Heinemann, 1997

Copyright 1998 - 2001, Ellen Stoner, MALS, ABOM, NCLC
Registered students may print one copy for study purposes.