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प्रश्न
With the help of a ray diagram explain the working of a reflecting telescope.
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उत्तर
Parallel light beams from an infinite distance are incident on two concave objective mirrors at first. They are incident on a secondary convex mirror after reflection. At F, a virtual image is produced. The rays meet at a point after reflection by the convex mirrors to generate a true image, which is perceived through the eyepiece.
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संबंधित प्रश्न
- A giant refracting telescope at an observatory has an objective lens of focal length 15 m. If an eyepiece of focal length 1.0 cm is used, what is the angular magnification of the telescope?
- If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 × 106 m, and the radius of lunar orbit is 3.8 × 108 m.
Write two important advantages of reflecting telescope over a refracting telescope.
With regard to an astronomical telescope of refracting type~ state how you will increase its:
1) magnifying power
2) resolving power
Define magnifying power of a telescope. Write its expression.
A lady cannot see objects closer than 40 cm from the left eye and closer than 100 cm from the right eye. While on a mountaineering trip, she is lost from her team. She tries to make an astronomical telescope from her reading glasses to look for her teammates. (a) Which glass should she use as the eyepiece? (b) What magnification can she get with relaxed eye?
Define the term ‘resolving power of a telescope’.
The magnifying power of an astronomical telescope in normal adjustment is 2.9 and the objective and the eyepiece are separated by a distance of 150 cm. Find the focal lengths of the two lenses.
In a telescope, the lens facing the object is called the:
For a terrestrial telescope used to observe objects on Earth such as mountains, trees, or players in a stadium, the final image must be:
The resolving power of a telescope is defined as:
