difine the principal focus and center of curvature of a spherical mirror
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the mid point of sphere is known as center of curvature
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Principal Focus, the point on the axis of a lens or mirror to which parallel rays of light converge or from which they appear to diverge after refraction or reflection........
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Centre of curvature , It is the curvature which have mid point in centre.....
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Principal Focus, the point on the axis of a lens or mirror to which parallel rays of light converge or from which they appear to diverge after refraction or reflection........
_____________
Centre of curvature , It is the curvature which have mid point in centre.....
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