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Four lenses L...

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Four lenses L1, L2, L3 and L4 having focal length 5 cm, 7 cm, 20 cm and 100 cm respectively are provided. The lenses most likely used as objective and eyepiece to construct a compound microscope are respectively

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Q. In a laboratory four convex lenses

L_{1}, L_{2}, L_{3}

L_{4}

of focal lengths

2, 4, 6

8

cm respectively are available. Two of these lenses form a telescope of length

10

cm and magnifying power

4

. The objective and eye lenses are respectively :

Q. Four lenses having the local length of +15 cm, 20 cm, +150 cm, and +250 cm respectively are provided to make a astronomical telescope. The focal length of the eyepiece to produce the largest magnification, should be :

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. the focal length of objective lens and eyepiece for a compound microscope are

0.95

5

cm and they are placed at

20

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

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