cse • paper_1 • waves_oscillations
[UPSC CSE 2010] Geometrical Optics (Q154, 10M)
Show that two convex lenses of the same material kept separated by a distance a, which is equal to the average of two focal lengths, may be used as an achromat, that is, a=\frac{1}{2}(f_1+f_2).
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