Q

A student places an object 20 cm in front of a concave mirror with a focal length of 10 cm, using the sign convention for spherical mirrors. What is the correct value and sign for the image distance?

RRB Group D 13 Aug, 2026 (9:00 AM - 10:30 AM) 2026
✓ Answer: A -20 cm
The object is at the centre of curvature because |u| = 2f = 20 cm. Therefore the image forms 20 cm in front of the mirror.
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