Q

A concave mirror has focal length 20 cm. An object is 60 cm in front of it. Find the real image distance.

RRB ALP (Stage-I); RRB Group-D 29/11/2024 / Shift-III; 22/08/2022 / Shift-III 2024; 2022
✓ Answer: A −30 cm
1/v = −1/20 + 1/60 = −1/30, hence v = −30 cm.
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