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In Young's experiment with white light, the central fringe is white. If now a transparent film is introduced in the upper beam coming from the top slit, then the white fringe:

1. moves downward
2. moves upward
3. remains at the same place
4. totally disappears

Correct answer: moves upward

Solution

The transparent film increases the optical path in the upper beam, so the condition for zero path difference is no longer at the original center. To restore the central white fringe, the whole fringe pattern shifts toward the upper slit, which means the central fringe appears upward.

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