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CBSE Class 10 Answered

a convex lens of focal length 40cm is placed in contact with a concave lens of focal length 20cm.
Asked by | 24 Jun, 2008, 08:52: PM
answered-by-expert Expert Answer

use the formula 1/F = 1/f1+ 1/f2

this will give combined focal length(use sign convention)

Answered by | 20 Jul, 2008, 12:10: PM

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