song tiêu
Học thuậtThân thiện
Definition
- Adjective:
- Bifocal: Describes an optical system, typically a lens, that has two distinct focal points or focal lengths. This allows for clear vision at two different distances, most commonly for near and far vision.
Usage Examples
- Adjective:
- Ông ấy đeo kính song tiêu để đọc sách và nhìn xa. (He wears bifocal glasses to read books and see far away.)
- Thấu kính song tiêu được thiết kế với hai phần quang học khác nhau. (A bifocal lens is designed with two different optical sections.)
Advanced Usage
- Technical/Physics Context: The term is primarily used in physics and optics. It precisely describes a lens property and is not typically used in metaphorical or abstract contexts.
- Hệ thống quang học song tiêu được ứng dụng trong kính thiên văn. (A bifocal optical system is applied in telescopes.)
Variants and Related Words
- Kính song tiêu / Tròng kính song tiêu (n): Bifocal glasses / Bifocal lenses. This is the most common compound form, referring to the physical eyeglasses or lenses.
- Đa tiêu (adj): Multifocal. A related term for lenses with more than two focal points (e.g., progressive lenses).
- Đơn tiêu (adj): Single-vision. A related term for lenses with only one focal length.
Synonyms
- Hai tiêu điểm (adj phrase): Having two focal points. This is a descriptive phrase rather than a direct technical synonym.
Notes on Meaning
- Specificity: "Song tiêu" is a specialized technical term. In everyday conversation, people are more likely to refer to "kính hai tròng" (two-part lenses) or simply "kính đọc sách có phần nhìn xa" (reading glasses with a part for distance) to describe bifocal glasses, though "kính song tiêu" remains the correct technical term.
- (vật lý) Bifocal