An object is placed in front of a concave mirror of focal length 10 cm. If it forms real image which is 2 times magnified then what is distance between object and mirror?
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Sol. As image is real and 2 times magnified
∴ m = – 2
and f = – 10 cm [As mirror is concave]
∴ m = 
- 2 = 
⇒ u = – 15 cm
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