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What is the minimum (non-zero) thickness, in nm, of a thin film (with (n = 1.506)...

What is the minimum (non-zero) thickness, in nm, of a thin film (with (n = 1.506) that will result in destructive interference when viewed at normal incidence and illuminated with blue light (\lambda_{vacuum} λ v a c u u m = 487 nm)? A glass slide (ng = 1.700) supports the thin film. Please round your answer to the nearest whole number.

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