A lens made of glass (ng =1.52) is coated with a thin film of MgF2 (ns = 1.38) of thickness t. Visible light is incident normally on the coated lens as in Figure P24.30. (a) For what minimum value of t will the reflected light of wavelength 5.40 x 102 nm (in air) be missing? (b) Are there other values of t that will minimize the reflected light at this wavelength? Explain.

Principles of Physics: A Calculus-Based Text
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Author:Raymond A. Serway, John W. Jewett
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Chapter27: Wave Optics
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Problem 23P: A beam of 580-nm light passes through two closely spaced glass plates at close to normal incidence...
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A lens made of glass (ng =1.52) is coated with a thin film of MgF2 (ns = 1.38) of thickness t. Visible light is incident normally on the coated lens as in Figure P24.30. (a) For what minimum value of t will the reflected light of wavelength 5.40 x 102 nm (in air) be missing? (b) Are there other values of t that will minimize the reflected light at this wavelength? Explain.

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