optical aberration

Thân thiện

A simple convex lens shows noticeable optical aberration when focusing sunlight onto a piece of paper.

Definition

Noun: - An optical phenomenon resulting from the failure of a lens or mirror to produce a good image: It refers to a flaw or imperfection in an image caused by the physical properties of an optical system, such as a lens, mirror, or the atmosphere. This results in light rays not converging at a single point, leading to a distorted or blurred image.

Usage

• General Use: The term is used in technical contexts like physics, astronomy, photography, and optics to describe image imperfections.
• Common Contexts: Discussing camera lenses, telescopes, microscopes, or eyeglasses.

Examples

• Noun:
  • The expensive telescope still showed a slight optical aberration near the edges of the view.
  • Chromatic aberration in the photograph appeared as a purple fringe around the high-contrast edges.
  • Lens designers work to minimize optical aberration to create sharper images.

Advanced Usage

• "Spherical aberration": A specific type where light rays striking the edges of a lens focus at a different point than rays striking the center.
  • Spherical aberration causes a general blurring of the entire image.
• "Chromatic aberration": A specific type where a lens fails to focus all colors (wavelengths) of light to the same convergence point, often seen as color fringing.
  • The photograph's chromatic aberration was corrected using software.

Variants and Related Words

• Aberration (n): A more general term for a departure from what is normal, usual, or expected. In optics, it is synonymous with "optical aberration."
  • The strange result was an aberration from the typical data pattern.
• Aberrated (adj): Describing something that exhibits aberration.
  • The aberrated image was difficult to analyze.

Synonyms

• Image distortion: A general term for any flaw in an image.
• Lens defect: Specifically implies a fault in the lens construction.
• Optical distortion: Often used interchangeably with optical aberration.

Related Phrases

• Correct for aberration: To adjust an optical system or use software to reduce the effects of aberration.
  • The new software algorithm helps correct for aberration in digital photos.
• Free from aberration: Describing an optical system or image that has no noticeable imperfections.
  • The mirror was ground to be free from aberration.

Notes

• The word aberration alone is often used in optical contexts to mean "optical aberration."
• This is a technical, uncountable noun when referring to the general phenomenon, but can be countable when referring to specific types (e.g., ).

Học thuật

Noun

1. an optical phenomenon resulting from the failure of a lens or mirror to produce a good image

Từ đồng nghĩa

• aberration
• distortion