Question

Which one of the following materials cannot be used to make a lens?

• A. Water
• B. Glass
• C. Plastic
• D. Clay

Answer 1

The correct option is D

Clay

Explanation for correct option:

1. A lens is a piece of transparent glass that concentrates or disperses light rays when passes through them by refraction.
2. Clay is an opaque material that cannot transmit light, so it cannot be used to make a lens.

Hence, option (D) is correct.

Explanation of incorrect options:

1. In case of option (A), water is a transparent medium and light gets refraction when it is allowed to pass through the water.
2. In case of option (B), glass is a transparent material and allows light to transmit through it.
3. In the case of option (C), transparent plastic material allows light to pass through it. Thus, it can be used to make lenses.

Hence, options (A), (B), and (C) are incorrect.