Question

Crown glass is a _________ glass.

• A. Optical
• B. Safety
• C. Radiation shield
• D. Toughened

Hint:

Crown glass is a high-quality optical glass with low dispersion, making it ideal for lenses in microscopes, telescopes, and eyeglasses.

Answer 1

The Correct Option is A

Crown glass is a type of optical glass known for its low dispersion and high transparency. It is commonly used in high-quality lenses and optical instruments. Step 1: Understanding the Properties of Crown Glass - Crown glass is made from a mixture of silica, sodium oxide, and calcium oxide, giving it a low refractive index and low dispersion. - It is widely used in microscope lenses, telescopes, and eyeglasses. - Crown glass differs from flint glass, which has a higher refractive index and is used in optical prisms.

Step 2: Evaluating the Options - Option (A) - Correct: Crown glass is primarily used as optical glass due to its excellent clarity and optical properties. - Option (B) - Incorrect: Safety glasses are made from laminated or tempered glass, not crown glass. - Option (C) - Incorrect: Radiation shielding glass contains lead oxide (PbO), not crown glass. - Option (D) - Incorrect: Toughened glass is heat-treated for strength, but crown glass is not primarily toughened.

Step 3: Conclusion Since crown glass is mainly used in optical applications, the correct answer is option (A).