[Solved] A Concave Mirror Forms a Real Image at 25

Question 79
Multiple Choice

A concave mirror forms a real image at 25.0 cm from the mirror surface along the principal axis. If the corresponding object is at a 20.0-cm distance, what is the mirror's focal length?

A) 1.43 cm
B) 16.7 cm
C) 7.14 cm
D) 11.1 cm

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