Question

why object distance is taken as negative in the case of convex and concave mirror​

Answer 1

Answer:

Since, object is always placed in front of the mirror hence object distance is taken as negative. Since, the centre of curvature and focus lie in front of the concave mirror, so radius of curvature and focal length are taken as negative in the case of concave mirror

Explanation:

Answer 2

Answer:

behind the mirror

Explanation:

Since, object is always placed in front of the mirror hence the sign of object is taken as negative. ... In the case of convex mirror, image always formed behind the mirror, thus the distance of image is taken as positive.