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Asked by | 25 Oct, 2008, 02:31: PM
answered-by-expert Expert Answer

Calculate the combined focal length (F) , using the given formula.

1/ F = 1/ f1 + 1/f2  [ f1 and f2 are  the focal lengths of convex and concave lenses in metre.]

then, calculate combined power D = 1/ F ( in metre)

If the D comes out to be positive , combination will behave as convergent and if it is negative the combination will behave as divergent.

Answered by | 26 Oct, 2008, 12:46: PM

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