Single correct option
A ray of light passing through the optical centre of a thin lens
- A. is bent towards the principal axis
- B. is bent away from the principal axis
- C. is reflected back
- D. passes undeviated
Show answer and solution
Answer: (D) passes undeviated
Near the optical centre both surfaces of a thin lens are nearly parallel, like a thin glass slab, so the ray emerges parallel to its original direction with negligible lateral shift. It passes through undeviated. Rays parallel to the axis are bent through the focus. Lens thickness at the centre is ignored for thin lenses.
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