ASTRONOMICAL REFRACTING TELESCOPE and REFLECTING TELESCOPE

This powerpoint begins by showing how light rays travel through a convex lens and how they form an image…
As an illustration of the use of a convex lens it includes showing how the camera and the magnifying glass each form an image.
It then goes on to show, step by step, how rays of light travel through an astronomical refracting telescope.
It also shows how the angular magnification can be found.

The second powerpoint shows how light rays travel tthrough a Cassegrain reflecting telescope.

Rays are drawn in stages to show all the steps in constructing an accurate ray diagram.