Q

A spherical mirror converges a beam at a point on its principal axis. Which statements are true? 1. The mirror is concave. 2. Its focal length is positive. 3. The convergence point is its principal focus.

RRB Group-D 22/08/2022 / Shift-III 2022
✓ Answer: D Both 1 and 3
The intended beam is parallel to the axis. A concave mirror converges it at F and has negative focal length under the Cartesian convention.
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