refracting telescope
Học thuậtThân thiện
Definition
Noun: An optical telescope that uses a large convex lens (objective lens) to gather light and produce a real image, which is then magnified for viewing through an eyepiece.
Usage
A refracting telescope is the classic telescope design that relies solely on lenses to bend (refract) light to a focal point. It is used for astronomical observation, terrestrial viewing, and in various optical instruments.
Examples
- Galileo improved the design of the early refracting telescope for his astronomical discoveries.
- For her first telescope, she chose a simple refracting telescope because of its straightforward operation.
- The museum displayed a historic refracting telescope from the 19th century.
Advanced Usage
- Achromatic refracting telescope: A more advanced design that uses a compound objective lens to reduce chromatic aberration (color fringing).
- Modern amateur astronomers often use an achromatic refracting telescope for planetary observation.
Variants and Related Words
- Refractor (n): A common shortened, informal term for a refracting telescope.
- His new refractor has excellent optics.
- Refraction (n): The bending of light as it passes from one transparent medium to another, which is the operating principle of this telescope.
Synonyms
- Dioptric telescope: A technical synonym emphasizing the use of lenses (dioptrics) rather than mirrors.
Related Terms and Concepts
- Objective lens: The large primary lens at the front of a refracting telescope that collects light.
- Eyepiece: The lens assembly at the back through which the magnified image is viewed.
- Reflecting telescope: A different type of optical telescope that uses mirrors instead of lenses to gather and focus light.
Noun
- optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece