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JEE Main 2025 Apr 4 Shift 1, Physics Q5: Young’s Double Slit Experiment

JEE Main2025Apr 4, Shift 1Physics
Q.

In a Young's double slit experiment, the slits are separated by 0.2 mm. If the slits separation is increased to 0.4 mm, the percentage change of the fringe width is:

  1. A

    0%

  2. B

    100%

  3. C

    50%

  4. D

    25%

Solution

Fringe width , so .

When doubles, becomes half — a 50% decrease.

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