define terms for a lens
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a lens is used in our eyes instead of a spectecal
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OPTIC CENTRE- centre of lens.
PRINCIPAL FOCUS- parallel rays of light falling on convex lens after refraction converges on common point on principal axis which is principal focus.
FOCAL LENGTH- distance between focus and optic centre.
PRINCIPAL FOCUS- parallel rays of light falling on convex lens after refraction converges on common point on principal axis which is principal focus.
FOCAL LENGTH- distance between focus and optic centre.
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