Question

In case of convex and concave mirror u is positive or negative.​

Answer 1

Answer:

Any distances measured on that side are positive. Distances measured on the other side are negative. f, the focal length, is positive for a concave mirror, and negative for a convex mirror. ... When the image distance is negative, the image is behind the mirror, so the image is virtual and upright.

Answer 2

Answer:

In

Explanation:

When the object is placed  front of the mirror(in front of the surface which is used for reflection) u will be positive both for concave and convex mirror