Q

A concave mirror of focal length 10 cm forms a real image 20 cm in front of it. What is the object distance?

RRB ALP (Stage-I) 25/11/2024 / Shift-III 2024
✓ Answer: B −20 cm
With f = −10 cm and v = −20 cm, 1/u = 1/f − 1/v = −1/20. Thus u = −20 cm.
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