1.

In a optical system, two thin convex lenses usedare in contact. If the focal lengths of them are 15cm and 10 em, find the effective focal length of the7)

Answer»

effective focal length 1/F = 1/f1 + 1/f2

=> 1/F = 1/15 + 1/10=> 1/F = (2+3)/30=> 1/F = 5/30=> 1/F = 1/6=> F = 6 cm



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