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Question

___ is the linear distance between the pole and principal axis.

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Solution

F= R/2, is the linear distance between the pole and principal axis, where F is the focal length and R is the radius of curvature. Principal focus is a point on the principal axis,where a beam of light, parallel to the principal axis, after reflection, either it actually meets or appears to meet and pole is the midpoint of a spherical mirror.

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