Question

A lens is made up of

• A. a transparent material
• B. an opaque material
• C. both transparent and opaque materials
• D. None of these

Answer 1

The Correct Option is A

Correct answer: a transparent material 

Explanation:
A lens is an optical device that bends light rays by refraction. To allow light to pass through it and undergo refraction, a lens must be made of a transparent material. 

Common materials used for making lenses include:
- Glass
- Plastic (such as acrylic or polycarbonate) 
These materials are transparent and allow light to pass through them with minimal absorption. 

Hence, the correct answer is: a transparent material.