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CGP EDU Academic Team
Published on: September 12, 2026
A spherical surface of radius of curvature 
, separates air from glass (refractive index
). The centre of curvature is in the glass medium. A point object ' 
' placed in air on the optic axis of the surface, so that its real image is formed at ' 
' inside glass. The line OI intersects the spherical surface at P and 
. The distance PO equals to
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A
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