Choose the one alternative that best completes the statement or answers the question. -A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm

Choose the one alternative that best completes the statement or answers the question.
-A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror. How far is the object from the mirror?
A) 20 cm
B) 7.5 cm
C) 5.0 cm
D) 15 cm

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