Question

Describe the construction and working of a refracting telescope with the help
of a labelled diagram. Why is it known as astronomical telescope ? What type of
image dues it form ?

Answer 1

Answer:

Working

Refracting telescopes work by using two lenses to focus the light and make it look like the object is closer to you than it really is. Both lenses are in a shape that's called 'convex'. Convex lenses work by bending light inwards (like in the diagram). This is what makes the image look smaller.

Construction

The telescope converts a bundle of parallel rays to make an angle α, with the optical axis to a second parallel bundle with angle β. The ratio β/α is called the angular magnification. ... Because the image was formed by the bending of light, or refraction, these telescopes are called refracting telescopes or refractors