Determine how far from the second lens is the final image
A lens having a focal length of 20 cm is positioned 45 cm in front of the lens with a focal length of 5.0 cm. Determine how far from the second lens is the final image of an object infinitely far from the first lens? Answer must be in cm.
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Determine the smallest angle of incidence with respect to the top mirror such that the laser beam (i) strikes just one of the mirrors and (ii) strikes each mirror just once.
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