There are two convex lenses \(L _1\) and \(L _2\) having focal lengths \(F _1\) and \(F _2\) res....

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There are two convex lenses \(L _1\) and \(L _2\) having focal lengths \(F _1\) and \(F _2\) respectively. The distance between \(L _1\) and \(L _2\) will be:
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