An object placed in front of a concave m...

An object placed in front of a concave mirror at a distance of x cm from the pole gives a 3 times magnified real image. If it is moved to a distance of (x+5) cm, the magnification of the image becomes 2. The focal length of the mirror is

15 cm

20 cm

25 cm

30 cm

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2012-Subject: Physics

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