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NEET 1996 (AIPMT) · Combination of Lenses

Combination of Lenses question from NEET 1996 (AIPMT)

Q82NEET 1996 · AIPMTEasy

Combination of Lenses

If a convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together, what will be their resulting power?

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Answer: (b)

$P = \frac{1}{f_1} + \frac{1}{f_2}$ (in metres), $f_1 = +0.8\text{ m}$ , $f_2 = -0.5\text{ m}$ .
$P = 1.25 - 2 = -0.75\text{ D}$
So the answer is (b) $-0.75\text{ D}$ .

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