Q.

Lens is made up of –

A. Pyrex glass
B. Flint glass
C. Ordinary glass
D. Cobalt glass
Answer» B. Flint glass
Explanation: Flint glass is optical glass that has relatively high refractive index and low Abbe number (high dispersion). A concave lens of flint glass is commonly combined with a convex lens of crown glass to produce an achromatic doublet lens because of their compensating optical properties, which reduces chromatic aberration (colour defects).
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