Question

In a Young's double slit experiment, the source is white light. One of the holes is covered by a red filter and another by a blue filter. In this case

• A. there shall be alternate interference patterns of red and blue
• B. there shall be an interference pattern for red distinct from that for blue
• C. there shall be no interference fringes
• D. there shall be an interference pattern for red mixing with one for blue.

Answer 1

Answer: (C)

there shall be no interference fringes

The light from two slits of Young's double-slit experiment is of different colours, and having different wavelengths and frequencies. Hence, there shall be no interference fringes.