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← ScienceIn the Fresnel biprism experiment, which mechanism modulates fringe spacing?
A)Changing the biprism refractive index
B)Decreasing the light source coherency
C)Increasing the screen distance slightly✓
D)Modifying the air turbulence amount
💡 Explanation
Increasing screen distance increases fringe distance because Young's Interference mechanism dictates that fringe spacing is proportional to the observation distance. Therefore, spacing changes directly with distance increases, rather than any refractive or source changes.
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