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NEET 1994 (AIPMT) · Optical Instruments & the Eye

Optical Instruments & the Eye question from NEET 1994 (AIPMT)

Q55NEET 1994 · AIPMTEasy

Optical Instruments & the Eye

Four lenses of focal length $\pm 15\text{ cm}$ and $\pm 150\text{ cm}$ are available for making a telescope. To produce the largest magnification, the focal length of the eyepiece should be

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Answer: (a)

$M = \dfrac{f_o}{f_e}$ : use the longest focal length for the objective and shortest for the eyepiece, both convex.
$f_o = +150\,\text{cm},\ f_e = +15\,\text{cm} \Rightarrow M = 10$
So the answer is (a) $+15$ cm.

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