Definition

1. Noun (Optics):
   • Eyepiece: The lens or group of lenses in an optical instrument (such as a microscope or telescope) that is closest to the viewer's eye. It magnifies the image formed by the primary lens or mirror (the objective) for observation.

Usage Examples

• Noun:
  • Hãy điều chỉnh thị kính cho đến khi bạn nhìn thấy hình ảnh rõ nét. (Adjust the eyepiece until you see a sharp image.)
  • Thị kính của kính hiển vi này có độ phóng đại 10x. (The eyepiece of this microscope has a 10x magnification.)
  • Anh ấy nhìn qua thị kính của kính thiên văn để quan sát các ngôi sao. (He looked through the telescope's eyepiece to observe the stars.)

Advanced Usage

• In professional contexts, the specifications of an eyepiece, such as its field of view and eye relief, are critical for detailed work.
  • Nhà khoa học chọn một thị kính có trường nhìn rộng để quan sát mẫu vật. (The scientist selected an eyepiece with a wide field of view to observe the specimen.)

Variants and Related Words

• Vật kính (Objective lens): The primary lens of a microscope or telescope, located closest to the object being observed. It gathers light to form a primary image.
  • Vật kính và thị kính làm việc cùng nhau để tạo ra độ phóng đại cao. (The objective lens and the eyepiece work together to create high magnification.)

Synonyms

• Ocular: A formal synonym for eyepiece, often used in technical manuals and scientific literature.
• Eye lens: A less common but descriptive term.

Related Terms

• Kính hiển vi (Microscope): An instrument containing both an objective lens and an eyepiece, used to view very small objects.
• Kính thiên văn (Telescope): An instrument for viewing distant objects, also employing an objective and an eyepiece.