define principal focus of spherical lens
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Principle focus - The rays coming parallel to principle axis after reflection from the lens meet at a point or appear to meet at a point on principal axis. This is called 'Principle focus of spherical lens'.
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Principle focus - The rays coming parallel to principle axis after reflection from the lens meet at a point or appear to meet at a point on principal axis. This is called 'Principle focus of spherical lens
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