Observatories and Telescopes

Observatories and Telescopes

• Astronomical Objects are so distant that their light is effectively parallel when it reaches earth.

• Converging (Convex) lenses and concave mirrors can be used to focus parallel rays of light.

• Power of lens in dioptres = 1 divided by the focal length (in metres)
  

• A converging lens forms a real image of a distant source of light.

• A simple telescope uses two converging lenses. The eyepiece is more powerful…