Question

For a convex lens focal length positive or negative? Also give reason

Answer 1

For a convex lens focal lens is positive.

the object is always placed at the left of the lens(negative) on the x axis.
rays coming from the object actually meat on the focus which is at opposite(positive) side
so focal length is positive.

hope it helps...

Answer 2

It's always positive.. Because when the image and object are at two different sides of a lens then the focal length is positive..

Hope it helps you

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