Question

When is radius of curvature negative in concave mirror when object is in front?

Answer 1

✔✅Sign in the case of concave mirror:

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

Answer 2

Explanation:

Sign in the case of concave mirror:

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.