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To what angular accuracy must two ostensibly perpendicular mirrors be aligned so that an incident ray returns within $1^{\circ}$ of its incident direction?...

Question

To what angular accuracy must two ostensibly perpendicular mirrors be aligned so that an incident ray returns within $1^{\circ}$ of its incident direction?

To what angular accuracy must two ostensibly perpendicular mirrors be aligned so that an incident ray returns within $1^{\circ}$ of its incident direction?



Answers

(II) At what angle should the axes of two Polaroids be placed so as to reduce the intensity of the incident unpolarized light to $(a){1\over 3}$, $(b){1\over 10}$?


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