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InterviewSolution
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A convex lens of focal length `f_(1)` is kept in contact with a concave lens of focal length `f_(2)`. Find the focal length of the combination. |
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Answer» For convex lens, focal length, `f = f_(1)` and for concave lens, the focal length, `f = -f_(2)`. The equivalent focal length of a combination of convex lens and concave lens is given as : `(1)/(F)=(1)/(f_(1))+(1)/(-f_(2))` `F = (f_(1)f_(2))/(f_(2)-f_(1))`. |
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