Question

A light ray parallel with the principle axis falls on a thin lens having a focal point $f$ as shown in the above figure. Identify which of the following statements best describes the lens?

• A. The lens is a converging lens
• B. The lens is thicker in the center than on the edges
• C. The lens is thinner in the center than on the edges
• D. The lens will always produce a real image
• E. The lens will always produce a virtual image

Answer 1

Answer: (C)

The lens is thinner in the center than on the edges

The rays parallel to the principal axis diverge after passing through the lens. This implies that the lens must be diverging lens i.e concave lens.

Hence the lens is thicker at the edges and thinner at the center.