Light in Air with Index of Refraction N₁ = 1

question 25

Multiple Choice

Light in air with index of refraction n₁ = 1.00059 is incident perpendicularly on a coated lens as shown.The coating of the lens has an index of refraction of n₂ = 1.30.The lens has an index of refraction n₃ = 1.60.What is the minimum thickness (in nm) of the coating needed to prevent reflection of light with a wavelength of 500 nm?

• A)96.2
• B)120.2
• C)150.2
• D)187.8
• E)234.8

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