Q

A concave mirror has a focal length of 20 cm. An object is 30 cm in front of it. What is the image distance?

RRB Paramedical (Stage-II) 30/04/2025 / Shift-II 2025
✓ Answer: B −60 cm
With f = −20 cm and u = −30 cm, 1/v = 1/f − 1/u = −1/60, giving v = −60 cm.
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