Two identical symmetric double convex lenses of focal length f are cut into two equal parts by AB plane and by XY plane as shown in figure respectively. The ratio of focal length of lenses and is [2025]

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Solution

Q.
Two identical symmetric double convex lenses of focal length f are cut into two equal parts $L_{1}, L_{2}$ by AB plane and $L_{3}, L_{4}$ by XY plane as shown in figure respectively. The ratio of focal length of lenses $L_{1}$ and $L_{3}$ is [2025]

1 1 : 4

2 1 : 1

3 2 : 1

4 1 : 2

Ans.
(4)

So, $\frac{f_{1}}{f_{3}} = 1 : 2$

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