The focal lengths of the objective and e...

The focal lengths of the objective and eye piece of an astronomical telescope are `25 cm and 2.5 cm` respectively. The telescope is fucussed on an object `1.5 m` from objective, the final image being formed `25 cm` from eye of the observer. Calculate the length of the telescope.

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The correct Answer is:

`31.85xx10^(-2)m,16.2`

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