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NEET 1997 (AIPMT) · Optical Instruments & the Eye

Optical Instruments & the Eye question from NEET 1997 (AIPMT)

Q53NEET 1997 · AIPMTEasy

Optical Instruments & the Eye

An astronomical telescope of tenfold angular magnification has a length of 44 cm. The focal length of the objective is

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Answer: (d)

$\dfrac{f_o}{f_e} = 10$ and $f_o + f_e = 44\,\text{cm}$ .
$11f_e = 44 \Rightarrow f_e = 4\,\text{cm},\ f_o = 40\,\text{cm}$
So the answer is (d) 40 cm.

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