4. In a biprism experiment, fifteenth dark band is observed at 3.5 mm from the central bright band when red light of wavelength 6400 A° is used. Keeping the arrangement undisturbed, red light is substituted by blue light of wavelength 4800 A°. What will be the new fringe width?

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In a biprism experiment, fifteenth dark band is observed at 3.5 mm from the central bright
band when red light of wavelength 6400 A° is used. Keeping the arrangement undisturbed, red
light is substituted by blue light of wavelength 4800 Aº. What will be the new fringe width?
4.
Transcribed Image Text:In a biprism experiment, fifteenth dark band is observed at 3.5 mm from the central bright band when red light of wavelength 6400 A° is used. Keeping the arrangement undisturbed, red light is substituted by blue light of wavelength 4800 Aº. What will be the new fringe width? 4.
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