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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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