- Early telescopes had converging lenses at the front and diverging as the eyepiece.
- Lenses have different focal points for different colours of light, making the image blurred.
A clearer image is formed by using a concave mirror instead of converging lenses.
-In a modern refracting telescopes is all a coverging lense.
- Reflecting telescopes are large but easy to move than a refracting telescope as the mirror has a smaller mass.
A simple reflecting telescope uses a large concave mirror, a plane mirror and a converging lens.
The concave mirror forms an image of a distant object, which is reflected towards the eyepiece using the plane mirror.
- Modern telescopes can be placed in observatories in high areas, away from pollution. The air is cooler so there is less interference from the atmosphere. The Hubble Space telescope produces images of space by using infrared and ultraviolet waves.
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