Question

Which glass is used for making lenses and prisms?

• A. Hard glass
• B. Flint glass
• C. Soda glass
• D. Borosilicate glass

Answer 1

Answer:

B. Flint glass

Flint glass is known for its high refractive index and high dispersion, making it the ideal choice for manufacturing high-quality lenses, prisms, and other optical instruments.

• Hard glass (usually containing calcium and potassium) and Soda glass (the common, low-cost glass for windows and bottles) are not suitable for precision optics due to their lower quality and optical properties.

• Borosilicate glass (like Pyrex) is known for its excellent resistance to thermal shock, making it ideal for laboratory glassware and cookware, but not typically the primary choice for precision optics.