In a Young's double slits experiment, the source is white light, one of the hole is covered by a red filter and another by a blue filter. In this case:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → there shall be no interference fringes
A steady interference pattern needs coherent sources: waves of the same frequency with a constant phase difference. The red filter passes only red light through one hole and the blue filter only blue light through the other. The two waves have different frequencies, so their phase difference changes continuously and the bright and dark positions shift all the time. On the screen the intensities of red and blue just add up, and no interference fringes are seen.
NCERT Exemplar:
Wave Optics – …
