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प्रश्न
Draw a labeled ray diagram of a reflecting telescope. Mention its two advantages over the refracting telescope.
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उत्तर
Reflecting Telescope,
Its two advantages over Refracting telescope:
1. It reduces the spherical aberration and forms a clear focused image.
2. It doesn’t require a lens of very large aperture as refracting type requires that cannot be manufactured easily.
संबंधित प्रश्न
A small telescope has an objective lens of focal length 144 cm and an eyepiece of focal length 6.0 cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece?
Why should the objective of a telescope have large focal length and large aperture? Justify your answer.
With regard to an astronomical telescope of refracting type~ state how you will increase its:
1) magnifying power
2) resolving power
Write the two important factors considered to increase the magnifying power?
Define its magnifying power and write the expression for it?
(i) What is meant by resolving power of a telescope?
(ii) State any one method of increasing the resolving power of an astronomical telescope.
Draw a ray diagram of astronomical telescope for the final image formed at infinity.
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?
An optical instrument that uses objective and eyepiece lenses to magnify distant terrestrial or celestial objects is called a:
In an astronomical (refracting) telescope, the objective lens has:
