Q

An object is 10 cm in front of a concave mirror. Its image is 15 cm away on the same side. What is the focal length?

RRB Group-D 01/09/2022 / Shift-II 2022
✓ Answer: C −6 cm
f = uv/(u + v) = (−10)(−15)/(−25) = −6 cm.
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