tiêu cự kế
Definition
- Noun:
- Focometer; Focimeter: An optical instrument used to measure the focal length of a lens or an optical system.
Usage Examples
- (The technician used a focimeter to inspect the lens.)
- Tiêu cự kế là dụng cụ quan trọng trong xưởng quang học. (The focometer is an important tool in an optical workshop.)
Advanced Usage
- The term is highly specialized and used almost exclusively in technical fields such as optics, photography, lens manufacturing, and optometry.
Variants and Related Words
- Máy đo tiêu cự: An alternative descriptive phrase meaning "focal length measuring device," which is functionally synonymous with .
Synonyms
- Focal length meter
- Lensometer (specifically in optometry for measuring eyeglass prescriptions)
Notes on Usage
- Tiêu cự kế is a technical compound noun. It is a fixed term and is not used in a figurative or idiomatic sense.
- The word is a combination of "tiêu cự" (focal length) and "kế" (a suffix meaning "meter" or "measuring device").