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प्रश्न
Why should the objective of a telescope have large focal length and large aperture? Justify your answer.
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उत्तर
The objective of a telescope have large focal length and large aperture because large focal length enhances the magnifying power of the telescope and large aperture help in collecting large amount of light coming from the object so that a bright image is obtained.
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संबंधित प्रश्न
Draw a schematic ray diagram of a reflecting telescope showing how rays coming from a distant object are received at the eyepiece.
Write two important advantages of reflecting telescope over a refracting telescope.
"A telescope resolves whereas a microscope magnifies." Justify this statement ?
How is the working of a telescope different from that of a microscope?
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?
In an astronomical telescope in normal adjustment, a straight black line of length L is drawn on the objective lens. The eyepiece forms a real image of this line whose length is 𝑙. What is the angular magnification of the telescope?
A telescope in which the eye lens used is concave, so that the final image is erect, is popularly called a:
In an astronomical (refracting) telescope, the objective lens has:
For a telescope, the object's visual angle is measured from its own position, which is effectively:
The resolving power of a telescope is defined as:
