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NEET 2006 (AIPMT) · Combination of Lenses

Combination of Lenses question from NEET 2006 (AIPMT)

Q77NEET 2006 · AIPMTEasy

Combination of Lenses

A convex lens and a concave lens, each having same focal length of 25 cm, are put in contact to form a combination of lenses. The power in diopters of the combination is

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Answer: (a)

$P = \frac{1}{f_1} + \frac{1}{f_2}$ with $f_1 = +0.25\text{ m}$ , $f_2 = -0.25\text{ m}$ .
$P = 4 - 4 = 0$
So the answer is (a) zero.

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