Question

Why ray of light passes undeviated through optical centre of a lens?

Answer 1

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In thin lenses the perpendicular distance between extended incident ray and extended emergent ray is negligible. So we can say that light ray passes through optical centre without deviation.

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Answer 2

Answer :

1. The portion of a lens near the optical centre is like a very thin slab of glass.

2. Hence, the rays of light pass undevitaed through optical centre of a lens.

Explanation :

Optical Centre :

1. The point inside a lens on the principle axis, through which light rays pass without changing their path is called the optical centre of the lens.

2. It is denoted by O.