the distance between the optical Centre and the principal focus of the lens is called it's_______
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Focal Length
The focal length of an optical system is a distance measure between principal focus and optical centre, it also defines the lens's angular field of view. For a given lens, the shorter the focal length, the wider the angular field of the lens.
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Focal length
That is why, a lens has two foci. They are at equal distance from the optical centre. Focal length of a convex lens: The distance between the optical centre and principal focus of a lens is called focal length.
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