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Question

An astronomical telescope has an eyepiece of focal-length 5 cm. If the angular magnification in normal adjustment is 10, when final image is at least distance of distinct vision (25 cm) from eye piece, then angular magnification will be :

A
10
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B
12
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C
50
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D
60
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Solution

The correct option is B 12
If m is the magnification of a telescope in normal adjustment, then
m=m(1+feD )

Substituting the values,

m=12

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