Before these reflected rays converge at the focus, they are deflected again by a small plane mirror.Light rays coming from space are reflected by the concave mirror.(a) The Newtonian telescope (Reflecting telescope) Explain the working of the above telescope. What other type of telescope uses a curved mirror?Į. Which type of mirror does the telescope use?ĭ. What type of telescope is shown in the figure?ī. Study the figure and answer the following questions:Ī. A refracting telescope can be made using two or more lenses.ĥ.A Cassegrain telescope can be made using a convex mirror, concave mirror and a lens.A Newtonian telescope can be made using a concave mirror, plane mirror and a lens.Which type of telescopes can be made using a concave mirror, convex mirror, plane mirror, and a lens? Draw diagrams of these telescopes. To get rid of all the above problems completely, the telescope is placed above the earth’s atmosphere, in space.Ĥ.To reduce these problems, optical telescopes are situated on top of mountains, in uninhabited places.During the night, city lights and cloudy weather cause difficulties. Because of sunlight, we cannot use optical telescopes during the day.Due to changes in atmospheric temperature and pressure light rays change their path.The intensity of visible light coming from a heavenly body decreases due to absorption as it passes through the Earth’s atmosphere.What are the difficulties in using ground-based optical telescopes? How are they overcome? The biggest optical telescope in India is situated at ………………….….ģ. The first scientist to use a telescope for space observations ………………….….Į. A certain X-ray telescope is named after scientist ………………….….ĭ. The wavelength of visible light is between ………………….…. Fill in the blanks with the proper words.Ī. Maharashtra State Board Class 9 Science Solutions Chapter 18 Observing Space: TelescopesĬlass 9 Science Chapter 18 Observing Space: Telescopes Textbook Questions and Answersġ. Balbharti Maharashtra State Board Class 9 Science Solutions Chapter 18 Observing Space: Telescopes Notes, Textbook Exercise Important Questions and Answers.
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