the ratio of the curvature to focal length of the spherical mirror is dash.the distance of the image of an object is measured from the dash of the spherical mirror
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We know that R=2f and f=R/2
R:f=2f/R/2=2f/f=2/1 i.e.2:1
An object is measured from pole of spherical mirror and in lens optical centre is used.
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