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Angular Magnification in Telescope

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Question

You are given the following three lenses. Which two lenses will you use as an eyepiece and as an objective to construct an astronomical telescope ? Give reason.

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Solution

For astronomical telescope, since the aperture of lens $L_{1}$ is largest,it is used as a objective for a telescope. The focal length of lens $L_{3}$ is smaller and hence can be used as a eyepiece.

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Q. (a) Draw a ray diagram depicting the formation of the image by an astronomical telescope in normal adjustment.
(b) You are given the following three lenses. Which two lenses will you use as an eyepiece and as an objective to construct an astronomical telescope ? Give reason.

Q. You are given following three lenses. Which two lenses will you see as an eyepiece and as an objective to construct an astronomical telescope?

Lenses	Power	Aperture
$L_{1}$	$3 D$	$8 c m$
$L_{2}$	$6 D$	$1 c m$
$L_{3}$	$10 D$	$1 c m$

Q. From the following three lenses, which two lenses will you use as an eyepiece and objective lens, to construct an astronomical telescope?

Lenses	Power	Aperture
$L_{1}$	$3 D$	$8 cm$
$L_{2}$	$6 D$	$1 cm$
$L_{3}$	$10 D$	$1 cm$

Q. From the following three lenses, two lenses are used as an eyepiece and the objective lens, to construct an astronomical telescope. Find the angular magnification for the normal adjustment.

Lenses	Power	Aperture
$L_{1}$	$3 D$	$8 cm$
$L_{2}$	$6 D$	$1 cm$
$L_{3}$	$10 D$	$1 cm$

Q. You are given two convex lenses of focal lengths 5 cm and 25 cm. Which one of these would you like to use as an objective in a telescope? Give reasons for your answer.

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