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Question
Study the figure and answer the following questions.
- What type of telescope is shown in the figure?
- Label the main parts of the telescope.
- Which type of mirror does the telescope use?
- What other type of telescope uses a curved mirror?
- Explain the working of the above telescope.
Answer in Brief
Solution
- Newtonian telescope is shown in the given figure.
- Both plane and spherical mirrors are used in this telescope. The spherical mirror is concave.
- Cassegrain telescope also uses a curved mirror.
- Light rays coming from a heavenly body (distant object) get reflected by the concave mirror. Before the reflected rays converge at the focus of the concave mirror, it is again reflected by the plane mirror, as shown. As a result, the rays pass through the eyepiece, and we get a magnified image of the body.
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