draw and state the three rules to draw ray diagrams of images by convex lenses
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(i) A ray of light incident at the optical center O of the lens passes undeviated through the lens.
(ii) A ray of light incident parallel to the principal axis of the lens, after refraction passes through the second focus F2
(in a convex lens) or appears to come from the
second focus F2(in a concave lens).
(iii) A ray of light passing through the first focus F1(ina convex lens) or directed towards the first focus F1(in a concave lens), emerges parallel to the principal axis after refraction.
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