simple optics: find focus!!
A marginal ray from infinity strikes a concave mirror at a distance of 'b' from the principal axis of the mirror. it is reflected from point Q and intersects the principal axis at point P. O is the optical center of the lens. find distance OP i.e. 'f'.
if 'f' can be given by :
find
Given p, q, r and s are integers.
and
The answer is 6.
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