Question

(v) Herapathite (iodo sulphate of quinine) is used in the
production of
(a) achromatic prism (b) polaroid
(c) biprism
(d) solar cell

Answer 1

Flint glass is used in opticals and prisms. Flint glass is optical glass that has a relatively high refractive index and low Abbe number. 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.

Hence option A is correct