Which one of the following types of glasses is used for making optical

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Which one of the following types of glasses is used for making optical instruments?

Pyrex glass
Soft glass
Hard glass
Flint glass
This question was previously asked in
UPSC CDS-2 – 2017
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The correct option is D) Flint glass.
Flint glass is a type of optical glass characterized by a high refractive index and relatively high dispersion. It is often used in combination with crown glass (lower refractive index, lower dispersion) to make achromatic lenses that reduce chromatic aberration (the distortion caused by the different wavelengths of light being refracted at slightly different angles). These properties are crucial for the performance of optical instruments like cameras, telescopes, and microscopes.
Pyrex glass is a borosilicate glass known for its thermal shock resistance and is used for laboratory glassware and cookware. Soft glass (soda-lime glass) is common glass used for windows and containers. Hard glass generally refers to types like borosilicate glass with high softening points but isn’t a specific category used for optical purposes like flint glass.

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