Final answer:
The focal length (f) of a concave mirror is half the radius of curvature (R), thus for a concave mirror with a radius of curvature of 22 cm, the focal length is 11 cm.
Step-by-step explanation:
The student's question is about finding the focal length of a concave mirror when the radius of curvature is given. The radius of curvature (R) is directly related to the focal length (f) of a mirror by the equation f = R/2.
Therefore, to find the focal length of a concave mirror with a radius of curvature of 22 cm, we divide the radius by 2. Applying the formula, we get f = 22 cm / 2, which equals 11 cm. This means that the focal length of the concave mirror is 11 cm.