Question

1. which of the following statements about a curved mirror is correct?

a. the pole of a curved mirror is at the center of its reflecting surface.
b. a converging mirror diverges parallel rays from a point call real focus.
c. a curved mirror converges parallel rays to a point called virtual focus.
d. the focal length of a spherical mirror is twice the radius of curvature.

Explanation:

• Option A: The pole (P) of a curved (spherical) mirror is indeed the center of its reflecting surface. This is a fundamental definition in the study of spherical mirrors.
• Option B: A converging (concave) mirror converges parallel rays (like those from a distant object) to a real focus, not diverge them. So B is incorrect.
• Option C: A converging mirror (concave) converges parallel rays to a real focus, while a diverging (convex) mirror diverges parallel rays and the focus is virtual. The statement is too general and incorrect as it misrepresents the type of focus for converging mirrors.
• Option D: The focal length (f) of a spherical mirror is half the radius of curvature (R), i.e., \( f=\frac{R}{2} \), not twice. So D is incorrect.

Answer:

A. The pole of a curved mirror is at the center of its reflecting surface.