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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) |
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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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