define the following: a) principal axis of a lens b)principal focus of a lens c)optical center of a lens d)aperture of a lens
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Principal axis is the straight line that passes through the center of curvatures. Aperture is defined as the diameter of the boundary of the circular lens. Principal focus is the point at which a beam of light that is parallel to principal axis will converge/diverges after refraction.
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a. the line passing through the principal focus
b.the point at which the light rays are meet together
c.the centre of the lens is known as the optical centres
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