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A lens made of glass ( n g = 1.52) is coated with a thin film of ( n s = 1.45 ) of thickness t . Visible light is incident normally on the coated...

A lens made of glass (ng = 1.52) is coated with a thin film of  (ns = 1.45 ) of thickness t. Visible light is incident normally on the coated lens as in the figure below.

a) For what minimum value of t will the reflected light of wavelength 554 nm (in air) be missing? nm

b) Are there other values of t that will minimize the reflected light at this wavelength? Explain.


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