Some telephoto cameras use a mirror rather than a lens what, Ask an Expert

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Some telephoto cameras use a mirror rather than a lens. What radius of curvature mirror is needed to replace a 855 mm focal length telephoto lens?

Keep getting this one wrong. I have no idea why.

I have as an equation F = R/2 so I did 0.855 m x 2 = 17.1 m.

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