Refracting Telescopes

1. What is refraction?

2. Draw a diagram showing the 2 lenses that you would find in a simple refracting telescope and several rays of light passing through them.

3. A simple telescope use an eyepiece of focal length 4cm and an objective of focal length 30 cm. Calculate its magnification.

4. What colour is refracted more, red or blue?

5. What problem does this cause with optical instruments such as telescopes?

6. Why is it not necessarily a good idea to get binoculars with a very high magnification?