A teacher places a fluid substance, with a refractive index of 1.65, between two horizontal panes...

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Physics

A teacher places a fluid substance, with a refractive index of1.65, between two horizontal panes of flat glass (each of which hasn = 1.50). He then illuminates the assembly from above withmonochromatic light (λ = 670 nm). What is the minimum thickness (innm) that the liquid layer must have, if the light is to be stronglyreflected back toward its source?

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