Question

Why does a light. Ray goes undeviated through optical centre of a lens?

Answer 1

Actually the same happens when the ray passes through optical centre. This can be observed in a thick lens. 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.

Answer 2

Answer:

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

2. Hence, a light ray goes undeviated 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 a lens.

2. It is denoted by O.