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| Q. |
Heat resistant variety of glass is – |
| A. | Pyrex glass |
| B. | Hard glass |
| C. | Flint glass |
| D. | None of these |
| Answer» C. Flint glass | |
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Explanation: Flint glass is optical glass that has relatively high refractive index and low Abbe number (high dispersion). Flint glasses are arbitrarily defined as having an Abbe number of 50 to 55 or less. The currently known flint glasses have refractive indices ranging between 1.45 and 2.00. 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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