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प्रश्न
Draw a ray diagram showing the image formation of a distant object by a refracting telescope ?
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उत्तर
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संबंधित प्रश्न
Why should the objective of a telescope have large focal length and large aperture? Justify your answer.
Draw a ray diagram depicting the formation of the image by an astronomical telescope in normal adjustment.
You are given three lenses of power 0.5 D, 4 D, and 10 D to design a telescope.
1) Which lenses should be used as objective and eyepiece? Justify your answer.
2) Why is the aperture of the objective preferred to be large?
Write two important limitations of a refracting telescope over a reflecting-type telescope.
A giant refracting telescope at an observatory has an objective lens of focal length 15 m. If an eyepiece lens of focal length 1.0 cm is used, find 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 3.42 × 106 m and the radius of the lunar orbit is 3.8 × 108 m.
Draw a ray diagram of a refracting astronomical telescope when final image is formed at infinity. Also write the expression for its angular magnification (magnifying power).
A telescope in which the eye lens used is concave, so that the final image is erect, is popularly called a:
Which type of telescope uses a convex lens as the eyepiece, since there is no necessity for an erect image?
In an astronomical (refracting) telescope, the objective lens has:
Modern telescopes often use a concave mirror rather than a lens for the objective primarily because:
