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=R/2#
#f=(i*o)/(i+o)#

Explanation:

#"f:focal point"#
#"R:the center of curvature"#
#"i:distance between image and vertex(mirror's center)"#
#"o: distance between object and vertex"#
#f=R/2#
#"or"#
#1/f=1/(o)+1/i#
#1/f=(i+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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