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Light in air with index of refraction n₁ = 1.00 is incident perpendicularly on a coated lens as shown. The coating of the lens has an index of refraction of n₂ = 1.62. The lens has an index of refraction n₃ = 1.48. What is the minimum thickness (in nm) of the coating needed to prevent reflection of green light (λ= 470 nm)?

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