Optical Telescope

• eyepiece

  Combination of lenses at the viewing end of optical instruments.

• objective

  The lens or system of lenses in a telescope or microscope that is nearest the object being...

Also contains

• camera lens

  A lens that focuses the image in a camera.

• compound lens

  A lens system consisting of two or more lenses on the same axis.

• converging lens

  Lens such that a beam of light passing through it is brought to a point or focu...

• condenser

  Lens used to concentrate light on an object.

• crown lens

  A lens made of optical crown glass.

• diverging lens

  A lens such that a parallel beam of light passing through it is caused to diverge...

• meniscus

  (optics) a lens that is concave on one side and convex on the other.

• Fresnel lens

  Lens composed of a number of small lenses arranged to make a lightweight lens of large...

• field lens

  The lens that is farthest from the eye in an optical device with more than one lens.

• intraocular lens

  An artificial lens that is implanted into the eye of someone to replace a damaged...

• monocle

  Lens for correcting defective vision in one eye; held in place by facial muscles.

• anastigmat

  Compound lens or lens system designed to be free of astigmatism and able to form approximately...

• anastigmatic lens

  A lens designed to correct astigmatism.

• contact

  A thin curved glass or plastic lens designed to fit over the cornea in order to correct...