Question

In Young's double slit experiment, a third slit is made in between the double slits. Then,

• A. Fringes of unequal width are formed.
• B. Contrast between bright and dark fringes is reduced.
• C. Intensity of fringes totally disappears.
• D. Only bright light is observed on the screen.

Answer 1

The correct option is B

Contrast between bright and dark fringes is reduced.

Explanation:

1. When a third slit is cut between the double slits in Young's double-slit experiment, the contrast between brilliant and dark fringes is lessened.
2. This is due to the fact that light passes through just two slits when using a double slit.

Hence, the correct option is (B).