Question

9) Water glass is used for making lenses of telescopes

• A. True
• B. False

Answer 1

The correct option is B False

• Water glass is composed of sodium silicate and is soluble in water.
• Water glass is used in the preservation of eggs as it increases the shelf life of eggs.
• Water glass has less field of view and is less curved than that optical glass whose field of view is much larger and is more curved, thus optical glasses are generally used to make lenses of telescopes.

Hence the above statement is ‘False’