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

1. optical telescope that has a large convex lens that produces an image that is viewed through the eyepiece