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A concave mirror of focal length 15 cm forms an image having twice the linear dimensions of the object.

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A concave mirror of focal length 15 cm forms an image having twice the linear dimensions of the object. The position of the object when the image is virtual will be- 

(A) 22.5 cm 

(B) 7.5 cm 

(C) 30 cm 

(D) 45 cm

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Best answer

Correct option (B) 7.5 cm

Explanation: 

f = – 15 cm for virtual & 2 times large image

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