Question

focal length of concavelens is postive or negative
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Answer 1

Answer:

the focal length is in the positive x direction for a convex lens while it is along the negative x direction for a concave lens. So f is positive for a convex lens and negative for a concave lens.

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Answer 2

Answer:

The focal length of Concave lens is negative .

Explanation:

The distance from the lens to the focal point is called the focal length. For converging lenses, the focal length is always positive, while diverging lenses always have negative focal lengths

so, f is positive for a convex lens and negative for a concave lens.