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MHT CET Physics question

PhysicsWave OpticsMHT CET

In a bi-prism experiment, when light of wavelength 6300Å is used, the fringe width is 0.45 mm. With the same setting, when source of wavelength 4200Å is used, the percentage decrease in fringe width will be [MHT-CET 2015]

Answer: (D)

Solution

, so the decrease is ; 42% and

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Question ID VK-077599