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Q.

If both the object and image are at infinite distances form a refracting telescope its magnifying power will be equal to 

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a

The sum of the focal lengths of the objective and the eyepiece

b

The ratio of the focal length of the eyepiece and objective

c

The ratio of the focal length of the objective and eyepiece

d

The difference of the focal lengths of the two lenses

answer is C.

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Detailed Solution

In case of a telescope if object and final image are at infinity then m=f0fe

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If both the object and image are at infinite distances form a refracting telescope its magnifying power will be equal to