CBSE · Class 10 · Science · Light – Reflection and RefractionWhat is meant by the principal focus of a concave mirror?
Step-by-Step Solution
The principal focus of a concave mirror is a specific point on its principal axis where parallel rays of light, coming from a distant object and travelling parallel to the principal axis, actually converge after getting reflected from the concave mirror. Since the reflected rays genuinely meet at this point, a concave mirror has a real principal focus. The distance measured from the pole of the mirror to this principal focus is known as the focal length of the mirror, which is always negative according to the New Cartesian Sign Convention.
💡 Study Guide: This question tests core syllabus concepts from Light – Reflection and Refraction. For formulas, key summaries, and mock exam reference guides, read the full Light – Reflection and Refraction Revision Notes.