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Why does this wavemeter use $3$ mirrors to turn light $180^\circ$ instead of just $2$?

optics reflection geometric-optics interferometry asked May 18 '17 at 4:37

physics.stackexchange.com

Does $\lim f(x) = \frac{1}{\lim\frac{1}{f(x)}}$?

calculus limits asked Apr 17 '17 at 14:45

math.stackexchange.com

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