Question

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

• A. glass
• B. acrylic
• C. water
• D. clay

Answer 1

The correct option is D clay

We know that water and glass are transparent material. Therefore, they can be used to form the lens.
There is some plastic that is transparent so the plastic can be used to make a lens but the clay is a opaque material so the light can't transmit through it so clay can't be used for making the lens.