Q

A concave mirror of focal length f forms an image equal in size to the object. What is the object distance u?

RRB Ministerial & Isolated Categories (Staff and Welfare Inspector); RRB Technicians Grade-III 10/09/2025 / Shift-III; 29/12/2024 / Shift-III 2025; 2024
✓ Answer: A Equal to 2f
Equal-size imaging occurs at the centre of curvature, whose distance is 2f in magnitude.
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