JEE Main 2025 — Wave Optics Question with Solution
From: JEE Main 2025 (Online) 8th April Evening Shift
Question
In a Young's double slit experiment, the source is white light. One of the slits is covered by red filter and another by a green filter. In this case:
Choose an option
Show full solutionCorrect option: D
there shall be no interference fringes.
Step-by-step explanation
When white light is used in Young's double slit experiment and one slit is covered by a red filter and the other by a green filter, several effects occur:
Different Fringe Widths: Each color will produce fringes of different widths due to their varying wavelengths. This means that red and green will not overlap perfectly.
Color Overlap: As the fringe patterns develop, some regions will have overlap due to the differing fringe spacings of red and green light. This overlap will create areas where the colors mix, potentially leading to an appearance of intermediate colors.
Overall, because each color produces its own pattern and these do not align, a clear interference pattern as seen with monochromatic light (a single color) will not be formed. Instead, there will be a complex pattern where the fringes do not distinctly appear as solid bands of red or green due to the overlapping and different fringe widths.
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This is a previous-year question from JEE Main 2025, covering the Wave Optics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.