a convex lens of focal length 40cm is placed in contact with a concave lens of focal length 20cm.

Asked by  | 24th Jun, 2008, 08:52: PM

Expert Answer:

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

this will give combined focal length(use sign convention)

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

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