Question

the focal length of a concave lens is taken negative.​

Answer 1

For focal length, f in lens is always taken as negative for concave and positive for convex. In case of mirror the f is taken as negative if it is in -X side i.e., is in Concave mirror and taken as positive if it is in +X side i.e., is in Convex mirror.

PLEASE MARK AS BRAINLIEST

Answer 2

Explanation:

Yes bro and convex lens is taken positive