Q647
Lens is made up of
A.
Pyrex glass
B.
Flint glass
AnswerC.
Ordinary glass
D.
Cobalt glass
Answer: Option B
Solution
Answer: Option B
Solution:
A lens is a transmissive optical device that focuses or disperses a light beam by the process of refraction.Flint glass is used as an optical glass because it has relatively high refractive index and low Abbe number than other materials.