Since the mirror is concave, the focal point will be in front of the mirror. The focal length is equal to one half of the radius of curvature.Rc is the radius of curvature. Plugging in 0.85m for Rc allows us to solve for the focal length.

Formula for focal lengthcalculator

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Formula for focal lengthof lens

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The focal point for a mirror is 56cm behind the mirror. Is the mirror concave or convex, and what is its radius of curvature?

What isfocal lengthof lens

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Since the focal point falls behind the mirror it must be convex. The radius of curvature can be found using the focal length equation.