Question

a) For concave mirror focal length is taken as ........
b) For convex mirror, radius of curvature is taken as ........

• A. $a=positive,b=negative$
• B. $a=negative,b=positive$
• C. $a=positive,b=positive$
• D. $a=negative,b=negative$

Answer 1

The correct option is B $a=negative,b=positive$

According to cartesian system focal length of a concave mirror is negative whereas radius of curvature of convex mirror is positive.