Question

The focal length \( f \) is related to the radius of curvature \( r \) of the spherical convex mirror by:

• A. \( f = + \frac{r}{2} \)
• B. \( f = -r \)
• C. \( f = -\frac{r}{2} \)
• D. \( f = r \)

Hint:

The focal length of a spherical convex mirror is half the radius of curvature: \( f = \frac{r}{2} \).

Answer 1

The Correct Option is A

Step 1: For a spherical mirror, the relationship between the focal length \( f \) and the radius of curvature \( r \) is given by the mirror equation: \[ f = \frac{r}{2}. \] Step 2: For a convex mirror, the focal length is positive, and the focal point lies behind the mirror.