Q

A concave lens of focal length 30 cm forms an image of an object 60 cm away. What are its image distance and nature?

RRB Group-D 27/09/2022 / Shift-I 2022
✓ Answer: A -20 cm, virtual and erect
With f = -30 cm and u = -60 cm, the lens formula gives v = -20 cm. The image is virtual and erect.
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