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An instructor places a fluid substance, with a refractive index of 1.61, between two horizontal panes of flat glass (each of which has

n = 1.55).

She then illuminates the assembly from above with monochromatic light

(? = 700 nm).

What is the minimum thickness (in nm) that the liquid layer must have, if the light is to be strongly reflected back toward its source?

??nm

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