Question

. derivation of the focal length formula.?
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Answer 1

Derivation of len's formula : Len's formula gives us the relation between focal length of a lens and distances of object and image from the optical centre of the lens. Let's consider a convex lens and O be the optical centre ; F the principal focus with focal length f.

Answer 2

Answer:

1/v + 1/u = 1/ f

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