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An object is kept in front of a concave ...

An object is kept in front of a concave mirror of focal length 15 cm. The image formed is three times the size of the object. Calculate two possible distances of the object from the mirror.

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20 cm and 10 cm
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CHHAYA PUBLICATION-REFLECTION OF LIGHT-PROBLEM SET - I
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  15. An object is kept in front of a concave mirror of focal length 15 cm. ...

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