Definition

Noun: - A type of optical glass: "optical flint" refers to a specific category of glass used in lenses and prisms. It is characterized by having both a high refractive index (its ability to bend light) and high dispersion (its ability to separate white light into its constituent colors, like a prism).

Usage

This term is highly technical and is used primarily in the fields of optics, physics, and lens manufacturing. - It is used to specify the material properties of glass in the design of optical instruments. - It contrasts with other types of optical glass, such as "crown glass," which typically has lower dispersion.

Examples

• Noun:
  • The prism was made from optical flint to achieve a sharp separation of the spectrum.
  • Designing an achromatic lens often requires combining a lens made of optical flint with one made of crown glass.

Advanced Usage

• In compound lens systems: "Optical flint" glass is often paired with crown glass in doublet lenses to correct chromatic aberration (color fringing).
  • The telescope's objective lens uses a crown glass element cemented to an optical flint element.

Variants and Related Words

• Flint glass (n): A more general, sometimes synonymous term for glass containing lead oxide, which gives it the high refractive index and dispersion. "Optical flint" is a specific, high-quality type of flint glass for precision optics.
• Crown glass (n): A contrasting type of optical glass with lower dispersion, often used in combination with flint glass.
• Dispersion (n): The optical property that "optical flint" possesses to a high degree.
• Refractive index (n): The other key optical property of "optical flint".

Synonyms

• High-dispersion glass: A descriptive synonym focusing on a key property.
• Flint optical glass: A variant phrasing.

Notes

• This is a technical compound noun. The word "flint" here does not refer to the stone, but historically indicates the use of flint (silica) in early glass recipes to increase its clarity and refractive properties. In modern contexts, lead or other heavy elements are typically used.

Noun

1. optical glass of high dispersion and high refractive index