Question

Why do rays passing through the optical centre of a lens go without bending?

Answer 1

Answer: A ray of light passing through the centre of curvature of a concave mirrorretraces its path (gets reflected along the same path), because as the ray of light passes through centre of curvature of a concave mirror it strikes the mirror along the normal i.e. it incidences on to the mirror at 90 degree.

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 passing through the optical centre of a lens go without bending.

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.