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JEE Main 202529 JanuaryEvening Shift
Exam
JEE Main
Year
2025
Date
29 January
Shift
Evening Shift
Subject
Physics
Chapter
Ray Optics

JEE Main 2025 · 29 January · Evening Shift · Physics · Ray Optics

Two identical symmetric double convex lenses of focal length f are...

Two identical symmetric double convex lenses of focal length ff are cut into two equal parts L1,L2L_1, L_2 by ABA B plane and L3,L4L_3, L_4 by XYX Y plane as shown in figure respectively. The ratio of focal lengths of lenses L1L_1 and L3L_3 is Two identical symmetric double convex lenses of focal length f are cut into two equal parts L_1, L_2 by A B plane and

Options

  1. A1:1
  2. B1:2
  3. C1:4
  4. D2:1

Correct answer

B. 1:2

Step-by-step solution

Two identical symmetric double convex lenses of focal length f are cut into two equal parts L_1, L_2 by A B plane and
so f1f3=1:2\frac{f_1}{f_3}=1: 2
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