Q. The focal length of a concave mirror with a radius of curvature of 20.0 cm is :
A) 5 cm
B) 20 cm
C) 15 cm
D) 10 cm
✔ Correct Answer: 10 cm
Exam Insight
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A) 5 cm
B) 20 cm
C) 15 cm
D) 10 cm
✔ Correct Answer: 10 cm
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