Pyrex or borosil glass is used for making laboratory apparatus whereas crown glass in used in themanufacture of optical instruments. Give reason.

Pyrex or borosil glass is used for making laboratory apparatus whereas

1.	Pyrex or borosil glass is used for making laboratory apparatus whereas crown glass in used in themanufacture of optical instruments. Give reason.
Answer» SOLUTION :PYREX or borosil glass consists of borax which reduces theexpandability of glass and provides heat resistance whereas of red lead in crown glass increases THEDENSITY of glass to a GREAT extent making it useful for optical INSTRUMENTS.