Question

The focal length of a concave mirror depends on:

• A. The radius of curvature of the mirror
• B. The object distance from the mirror
• C. The image distance from the mirror
• D. Both the image and the object distance

Answer 1

The correct option is A The radius of curvature of the mirror

For any spherical mirror, the focal length $f$ is equal to half of the radius of curvature$R$.

$f=\frac{R}{2}$

So, the focal length of a concave mirror depends upon the radius of curvature of the mirror.