3. What happens to the rays falling parallel to the axis on a concave lens ? in one word
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An incident light ray parallel to the principal axis of a concave lens passes through it and diverges. ... The incident rays which are parallel to the principal axis appear to diverge from a point on the principal axis after entering through the concave lens. This point is known as the focal point of a concave lens.
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Concave or Diverging lens. An incident light ray parallel to the principal axis of a concave lens, passes through it and diverges.
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