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The focal length of a concave mirror with a radius of curvature of 20.0 cm is:
20 cm
5 cm
10 cm
15 cm
Using the formula $$F=\frac{R}{2}$$, we can get the answer.
R=20 cm
Therefore $$F=\frac{R}{2}=10 cm$$
The focal length of a concave mirror is always positive.
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