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Four lenses having the focal length of +...

Four lenses having the focal length of +45cm, +20 cm, +450 cm and +250 cm respectively are provided to make an astronomical telescope. The focal length of the eye piece to produce the largest magnification should be

A

`+15cm`

B

`+50cm`

C

`-150cm`

D

`-15cm`

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The correct Answer is:
A
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