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NEET 2019 · Combination of Lenses

Combination of Lenses question from NEET 2019

Q53NEET 2019Easy

Combination of Lenses

An equiconvex lens has power $P$ . It is cut into two symmetrical halves by a plane containing the principal axis. The power of one part will be,

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Answer: (a)

A cut by a plane containing the principal axis keeps both curved surfaces and $R$ unchanged for each half.
$P = (\mu-1)\left(\frac{1}{R_1} - \frac{1}{R_2}\right)$ is unchanged; only the aperture (brightness) halves.
So the answer is (a) $P$ .

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