Q
A real, inverted image is formed at a distance of 30 cm in front of a concave mirror when an object is placed 60 cm from the mirror. Which statement best describes the focal length of the mirror?
RRB Group D
21 Aug, 2026 (4:30 PM - 6:00 PM)
2026
✓ Answer:
A
The focal length of the mirror is - 20 cm
The correct choice is The focal length of the mirror is - 20 cm. It follows from the laws of reflection/refraction and the standard image-formation properties of lenses, mirrors or optical systems.