You Apply a Material with N = 1

question 57

Multiple Choice

You apply a material with n = 1.25 to a lens (n_g = 1.5) to make a nonreflective coating due to destructive interference at a wavelength (in a vacuum) of 555 nm.What is the minimum thickness of the coating that you need?

• A)56 nm
• B)110 nm
• C)220 nm
• D)280 nm
• E)140 nm

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