what is pole and principal foucs?
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POLE✔
IT is the midpoint of spherical mirror which bisect the spherical mirror into two equal parts.
PRINCIPAL FOCUS✔
It is the point on principal Axis at which light rays paralell to principal axis really passes or appears to pass after reflection from spherical mirror.
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The point where the principal axis pierces the merror is called the pole of the merror ... That makes this is a conversing merror and the point where the rays converge is called focal point or focus .
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