vật kính
Definition
- Noun:
- Objective lens: The primary light-gathering lens or system of lenses in an optical instrument (such as a microscope, telescope, or camera) that is positioned closest to the object being observed or photographed. It is responsible for forming the initial real image.
Usage Examples
- Noun:
- Vật kính của kính hiển vi cần được giữ sạch sẽ. (The microscope's objective lens must be kept clean.)
- Anh ấy vô tình làm xước vật kính máy ảnh. (He accidentally scratched the camera's objective lens.)
- Kính thiên văn này có vật kính đường kính 10 inch. (This telescope has an objective lens with a 10-inch diameter.)
Advanced Usage
- In compound optical systems, the "vật kính" is distinguished from the eyepiece ("thị kính"), which is the lens closest to the viewer's eye.
- "Tiêu cự vật kính": objective focal length.
- Tiêu cự vật kính quyết định độ phóng đại. (The objective focal length determines the magnification.)
Variants and Related Words
- Thị kính (n): eyepiece; the lens or group of lenses in an optical instrument through which the viewer looks.
- Ống kính (n): lens; a general term for a lens or lens assembly, often used interchangeably with "vật kính" in casual contexts for cameras.
Synonyms
- Objective lens: The main lens that receives light from the object.
- Object lens: Another term for the primary lens in a system.
Related Terms
- Khẩu độ (n): aperture; the opening that determines the angle of the light rays that reach the objective lens.
- Độ phóng đại (n): magnification; the power of an optical instrument to enlarge an image.