An object is placed at a distance of 30 cm from the pole of a concave mirror. If its real and inverted image is formed at 60 cm in front of the mirror, the focal length of the mirror is:
(A) – 15 cm
(B) -20 cm
(C) + 20 cm
(D) + 15 cm
Correct Answer : Option (A) – 15 cm
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