Question: Suppose that we look at a source perpendicularly through a stack of N microscope slides. The source seen through even a dozen slides will be

Suppose that we look at a source perpendicularly through a stack of N microscope slides. The source seen through even a dozen slides will be noticeably darker. Assuming negligible absorption, show that the total transmittance of the stack is given by

T_t = (1 - R)^2N

and evaluate T_t for three slides in air.

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