lens of spectacles are made from which substance – InterviewSolution

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1.	lens of spectacles are made from which substance
Answer» Crown glass: Usually this is asoda-lime-silica glassand it is frequently used in making lenses of eye glasses.Crookes glass: In this glass mainly cerium oxide (CiO2) is present which sharply absorbs the ultraviolet rays from the sunlight so utilised in making lenses of eye glasses

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