Optical glass used in the construction of spectacles is made by ___________.

Flint glass

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Crookes glass

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Quartz glass

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Hard glass

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Solution

The correct option is B Flint glass
Optical glass used in the construction of spectacles is made by flint glass. It is because flint glass has relatively high refractive index and high dispersion. As it absorbs most of the UV light but comparatively little visible light, it is also used for telescope lenses.

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