Question

The ray which is parallel to the principal axis has one more name. what is it?
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Answer 1

Answer:

When the parallel rays of light pass through a concave lens to the principal axis, it deviates from its focal point and refracts the light rays. Due to this reason, it is called the 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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Answer 2

Parallel incident rays passes through focus for concave mirror and convex lens while it appears to pass through focus for convex mirror and concave lens.