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Telescopes with large aperture objective...

Telescopes with large aperture objectives are chosen because they

A

Have less aberrations

B

Have better dispersion

C

Have better resolution

D

Can see larger objects

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What is an aperture?

A small telescope has an objective lens of focal length 144cm and an eyepiece of focal length 6.0cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece?

(a) A giant refracting telescope at an observatory has an objective lens of focal length 15m. If an eyepiece of focal length 1.0cm is used, what is the angular magnification of the telescope? (b) 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 xx 10^(6)m , and the radius of lunar orbit is 3.8xx10^(8)m .

Calculate the limit of resolution of a telescope given that the diameter of the objective is 1.5 m and wavelength of the light used is 555 nm.

Which of the two, objective or eye piece has a large aperture? Give reason for your answer.

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A small telescope has an objective lens of focal length 140cm and an eyepiece of focal length 5.0cm. What is the magnifying power of the telescope for viewing distant objects when (a) the telescope is in normal adjustment (i.e., when the final image is at infinity)? (b) the final image is formed at the least distance of distinct vision (25cm)?

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