How can I calculate the focal point of concave mirror?

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How can I calculate the focal point of concave mirror?

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Answer 1 · 2016-02-16T12:02:14

$f = \frac{R}{2}$ $f=R/2$
$f = \frac{i \cdot o}{i + o}$ $f=(i*o)/(i+o)$

Explanation:

$f:focal point$ $"f:focal point"$
$R:the center of curvature$ $"R:the center of curvature"$
$i:distance between image and vertex(mirror's center)$ $"i:distance between image and vertex(mirror's center)"$
$o: distance between object and vertex$ $"o: distance between object and vertex"$
$f = \frac{R}{2}$ $f=R/2$
$or$ $"or"$
$\frac{1}{f} = \frac{1}{o} + \frac{1}{i}$ $1/f=1/(o)+1/i$
$\frac{1}{f} = \frac{i + o}{i \cdot o}$ $1/f=(i+o)/(i*o)$
$f = \frac{i \cdot o}{i + o}$ $f=(i*o)/(i+o)$

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How can I calculate the focal point of concave mirror?

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