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a thin plastic with an n=1.67 is 1.32x10-6m thick. It is between two glasses with reflective...

a thin plastic with an n=1.67 is 1.32x10-6m thick. It is between two glasses with reflective index of 1.50 and 1.56, white light is first incident on the slab for n=1.50. Which visible wavelengths are missing in the reflected light?

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