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Asked by | 25th Oct, 2008, 02:31: PM
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 | 26th Oct, 2008, 12:46: PM
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