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प्रश्न
Which type of telescope can be made using a concave mirror, convex mirror, plane mirror and a lens? Draw diagrams of these telescopes.
उत्तर
Reflecting types of telescopes can be made using a concave mirror, convex mirror, plane mirror and a lens. Reflecting type of telescopes is mainly of two types:
- Newtonian telescope:
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.
The Newtonian telescope - Cassegrain telescope:
In this telescope, the light rays, after reflection from the concave mirror, are reflected towards it by a small convex mirror. Then, the rays pass through the eyepiece placed at the back of the concave mirror, as shown. The eyepiece produces a magnified image of the source.
The Cassegrain telescope
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संबंधित प्रश्न
Explain the construction of Galileo’s telescope.
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.
Telescope was invented by______.
True or False – If False give the correct answer
Galilio accepted the Geo-centric model.
State Snell’s law.
Myopia is due to ______.
The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 Å is of the order of ______.
A telescope of objective lens diameter 2 m uses light of wavelength 5000 Å for viewing stars. The minimum angular separation between two stars whose image is just resolved by their telescope is ______.
