Which one of the following types of glasses is used for making optical instruments?
Pyrex glass
Soft glass
Hard glass
Flint glass
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This question was previously asked in
UPSC CDS-2 – 2017
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.