They use the idea of angle of incidence = angle of refraction
A parabolic mirror is used
They suffer from chromatic aberration
Question 15
Question
What are the differences and similarities between reflecting telescopes and Cassegrain Telescopes?
Answer
They both use elliptical mirrors
They both suffer from spherical aberration
A reflecting telescope has only one mirror, while a cassegrain telescope has two - a primary mirror and a secondary mirror
Both mirrors have holes in them
Question 16
Question
A Cassegrain reflector uses a secondary mirror to direct light rays reflected by the primary mirror through a hole in the primary mirror towards the observer