AP Free Response Question
2010 B5
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As shown above, a beam of red light of wavelength 6.65 x 10
^{-7}
meters in air is incident on a glass prism at an angle
q
_{1}
with the normal. The glass has index of refraction n = 1.65 for the red light. When
q
_{1}
= 40 degrees, the beam emerges on the other side of the prism at an angle
q
_{4}
= 84 degrees.
(a) Calculate the angle of refraction
q
_{2}
at the left side of the prism.
(b) Using the same prism, describe a change to the setup that would result in total internal reflection of the beam at the right side of the prism. Justify your answer.
(c) The incident beam is now perpendicular to the surface. The glass is coated with a thin film that has an index of refraction n
_{f}
= 1.38 to reduce the partial reflection of the beam at this angle.
i. Calculate the wavelength of the red light in the film.
ii. Calculate the minimum thickness of the film for which the intensity of the reflected red ray is near zero.
Topic Formulas
Description
Published Formula
linear deviation
magnification
spherical mirror focal length
thin lens/mirror equation
Young's Equation
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