Question

class 10th which lens has the negative focal length?​

Answer 1

Answer:

If the image and object are on the same side of the lens, the image distance is negative and the image is virtual. For converging mirrors, the focal length is positive. Similarly, a converging lens always has a positive f, and a diverging lens has a negative f.

Answer 2

Answer:

hey I think the question is not apt .

Explanation:

see for a lens you have a principal axis on which all those focus , centre of curvature and all lies.

so in general we take all values ( object distance , image distance, focal length , radius of curvature ) to the left of the lens as negative whether it is a convex lens or a concave lens .

And positive values are taken for the measures to the right side of the lens .

I hope you got it clear .

promote my answer only if it did help you.

thank you.