The coherent monochromatic light beams of intensities 4I and 9I are superposed. What will be the maximum and minimum possible intensities?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 25I, I
The maximum intensity is,
$I_{max}=(\sqrt{I_1}+\sqrt{I_2})^2$
$=(\sqrt{4I}+\sqrt{9I})^2$
$=25I$
The minimum intensity is,
$I_{max}=(\sqrt{I_1}-\sqrt{I_2})^2$
$=(\sqrt{4I}-\sqrt{9I})^2$
$=I$