Question

How can I calculate the focal point of concave mirror?

Answer 1

`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)`