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MHT CET 2019 (2 May, Shift 1) · Combination of Lenses

Combination of Lenses question from MHT CET 2019 (2 May, Shift 1)

Q52MHT CET 2019 · 2 MAY · SHIFT 1Easy

Combination of Lenses

The equi-convex lens has a focal length ' $f$ '. If the lens is cut along the line perpendicular to the principal axis and passing through the pole, what will be the focal length of any half part?

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Answer: (b)

A cut through the pole perpendicular to the axis gives two plano-convex lenses.
Each has only one curved surface, so its power is half: $\frac{1}{f'} = \frac{1}{2f}$ .
So the answer is (b) $2f$ .

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