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JEE Main 2024 (4 Apr, Shift 1) · Combination of Lenses

Combination of Lenses question from JEE Main 2024 (4 Apr, Shift 1)

Q26JEE Main 2024 · 4 APR · SHIFT 1Easy

Combination of Lenses

An effective power of a combination of 5 identical convex lenses which are kept in contact along the principal axis is $25\text{ D}$ . Focal length of each of the convex lens is:

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Answer: (b)

Identical lenses in contact: $P = 5p$ .
$5p = 25\text{ D} \Rightarrow p = 5\text{ D}$
$f = \frac{1}{5}\text{ m} = 20\text{ cm}$
So the answer is (b) 20 cm.

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