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z Medical Questions

Your Question
A glass lens is coated on one side with a thin film of magnesium fluoride (MgF2) to reduce reflection from the lens surface (figure below). The index of refraction of MgF2 is 1.38; that of the glass is 1.50. Assume that the light is perpendicular to the lens surface and the coating eliminates the reflection of light of wavelength 550 nm at normal incidence.

http://www.webassign.net/hrw/hrw7_35-20.gif

(a) Calculate the percentage by which reflection is diminished by the coating at 435 nm.

(b) Calculate this percentage for a wavelength of 695 nm.
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