Geometric Optics

Telescopes and Fresnel Lenses

Solutions

Q1: How does what you see through your telescope differ from the actual object? Draw a ray diagram.

The image produced by the Galilean telescope should be bright, enlarged and virtual.

Q2: How does what you see through your telescope differ from the actual object? Draw a ray diagram.

The image seen through the Keplerian telescope should be bright, enlarged, real and inverted.

Q3: Look through a converging lens. Now look through your Keplerian Telescope. How are the two images different? Why are they different? Use a ray diagram in your explanation if needed.
The image produced by the telescope is inverted and larger. The converging lens would produce a real image by itself. This real image becomes a "virtual object" for the diverging lens, which uses it to make a much larger "virtual object."

Q4: Look through a diverging lens. Now look through your Galilean Telescope. How are the two images different? Why are they different? Use a ray diagram in your explanation if needed.

The image produced by the telescope is larger. The objective len produces a real image inside the telescope, and the eyepiece is a magnifying glass for examining this image.


Seat Activities
Activity
Contributors