Types of Telescopes - Types of Telescopes There are two...

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Types of Telescopes There are two basic types of telescopes, refractors and reflectors. The part of the telescope that gathers the light, called the objective , determines the type of telescope. A refractor telescope uses a glass lens as its objective. The glass lens is at the front of the telescope and light is bent (refracted) as it passes through the lens. A reflector telescope uses a mirror as its objective. The mirror is close to the rear of the telescope and light is bounced off (reflected) as it strikes the mirror. Refractor Telescopes The refractor telescope uses a lens to gather and focus light. The first telescopes built were refractors. The small telescopes sold in department stores are refractors, as well as, those used for rifle scopes. Advantages 1. Refractor telescopes are rugged. After the initial alignment, their optical system is more resistant to misalignment than the reflector telescopes. 2. The glass surface inside the tube is sealed from the atmosphere so it rarely needs cleaning.
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