The image (of a real object) formed by a concave mirror is twice the size of the object

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Geometric Optics · Geometric Optics

Problem

The image (of a real object) formed by a concave mirror is twice the size of the object. The focal length of the mirror is 20 cm. The distance of the object from the mirror is (are) (a) 10 cm (b) 30 cm (c) 25 cm (d) 15 cm

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