define principal focus and focal length
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principal focus is the point at which all rays intersect after refraction or reflection
focal length is distance between pole and focus
focal length is distance between pole and focus
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Focal length-the distance between the pole and focus of the mirror.
principal focus-the point on the principal axis ,where all rays, incident parallel to principal axis, actually meet ,or appear to meet , after their reflection by the spherical mirror
principal focus-the point on the principal axis ,where all rays, incident parallel to principal axis, actually meet ,or appear to meet , after their reflection by the spherical mirror
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