Q.

Which one of the following is used for sun glasses?

A. Pyrex glass
B. Flint glass
C. Crooks glass
D. Crystal glass
Answer» C. Crooks glass
Explanation: A type of glass that contains cerium and other rare earths and has a high absorption of ultraviolet radiation is used in sunglasses. Sunglasses or sun glasses are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes. They can sometimes also function as a visual aid, as variously termed spectacles or glasses exist, featuring lenses that are coloured, polarized or darkened.
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