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Telescopes

In a telescop...

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In a telescope, the main function of the objective lens is to collect the light coming from distant objects.

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Q. The angular magnification of an astronomical telescope in normal adjustment is 36, and the diameter of the objective lens is 72 mm. What is the minimum diameter of the eyepiece required to collect all the light entering the objective lens from a distant point source on the axis of the instrument?

Q. A simple telescope, consisting of an objective of focal length

60 c m

and a single eye lens of focal length

5 c m

is focused on a distant object is such a way that parallel rays comes out from the eye lens. If the object subtends an angle

2^{o}

at the objective, the angular width of the image:

Q. A simple telescope consisting of an objective of focal length 60 cm and single eye lens of focal length 5 cm is focused on a distant object is such a way that parallel rays come out from the eye lens. If the object subtends an angle

2^{\circ}

at the objective, the angular width of the image :

Q. A small telescope has an objective lens of focal length

150 c m

and eyepiece of focal length

5 c m

. What is the magnifying power of the telescope for viewing distant objects in normal adjustment?
If this telescope is used to view a

100 m

3

km away, what is the height of the image of the tower formed by the objective lens?

Q. Statement I: In a telescope, the eyepiece is used to form a large virtual image of the object.
Statement II: In a telescope, the main function of the objective lens is to collect the light coming from distant objects.

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