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Q: A light ray passing through the ______ of a lens passes without any deviation.
  • A. optical centre
  • B. edges
  • C. 2F (twice of focal length)
  • D. Focus
Correct Answer: Option A - A light ray passing through the optical centre of lens passes without any deviation. Principal focus is the point where the beam parallel to principal axis passes through or appears to pass through that point after passing through lens.
A. A light ray passing through the optical centre of lens passes without any deviation. Principal focus is the point where the beam parallel to principal axis passes through or appears to pass through that point after passing through lens.

Explanations:

A light ray passing through the optical centre of lens passes without any deviation. Principal focus is the point where the beam parallel to principal axis passes through or appears to pass through that point after passing through lens.