4941Chemical EngineeringMedium
Contact lenses for eyes are made of Perspex, which is nothing but________?
APolypropylene
Bpoly-methyl-methacrylate
CPolystyrene
DUnsaturated polyester
Correct answer
B. poly-methyl-methacrylate
Explanation
The correct answer is poly-methyl-methacrylate.