Q72 / 75 · JEE Main 2025 (3 Apr Shift 2) · Physics

Two monochromatic light beams have intensities in the ratio 1:9. An interference pattern is obtained by these beams. The ratio of the intensities of maximum to minimum is

  • A
    $8: 1$
  • B
    $9: 1$
  • C
    $3: 1$
  • Correct answer
    D
    $4: 1$

Solution

$\frac{I_{\max }}{I_{\min }}=\frac{\left(\sqrt{I_1}+\sqrt{I_2}\right)^2}{\left(\sqrt{I_1}-\sqrt{I_2}\right)^2} \Rightarrow \frac{(4)^2}{(2)^2} \Rightarrow \frac{16}{4}=4$

Hence, the correct answer is option: 'D'.

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