Q

A student places a small object 20 cm from a concave mirror of focal length 10 cm. According to the mirror formula, what will be the image distance?

RRB Group D 20 Aug, 2026 (12:45 PM - 2:15 PM) 2026
✓ Answer: B 20 cm in front of the mirror
The correct choice is 20 cm in front of the mirror. It follows from the laws of reflection/refraction and the standard image-formation properties of lenses, mirrors or optical systems.
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