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Lens Maker's Formula

From the foll...

Question

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

$L_{1}$ $3 D$ $8 cm$

$L_{2}$ $6 D$ $1 cm$

$L_{3}$ $10 D$ $1 cm$

A

L_{1} -

Objective lens,

L_{3} -

Eyepiece

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B

L_{3} -

Objective lens,

L_{1} -

Eyepiece

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C

L_{1} -

Objective lens,

L_{2} -

Eyepiece

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D

L_{2} -

Objective lens,

L_{3} -

Eyepiece

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Solution

The correct option is A $L_{1} -$ Objective lens, $L_{3} -$ Eyepiece
In astronomical telescope :

$(i)$ Objective lens has lower power with a longer aperture.

$(i i)$ Eyepiece has greater power with a smaller aperture.

Therefore, $L_{1}$ should be used as objective lens while $L_{3}$ should be used as eyepiece.

Hence, option $(A)$ is the correct answer.

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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.

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$L_{3}$	$10 D$	$1 cm$

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