In double slit experiment fringes are obtained using light of wavelength `4800 Å` One slit is covered with a thin glass film of refractive index. `1.4` and another slit is covered by a film of same thickness but refractive index `1.7`. By doing so, the central fringe is shifted to fifth bright fringe in the original pattern. The thickness of glass film isA. `2xx10^(-3)mm`B. `4xx10^(-3)mm`C. `6xx10^(-3)mm`D. `8xx10^(-3)mm`

In double slit experiment fringes are obtained using light of waveleng

1.	In double slit experiment fringes are obtained using light of wavelength `4800 Å` One slit is covered with a thin glass film of refractive index. `1.4` and another slit is covered by a film of same thickness but refractive index `1.7`. By doing so, the central fringe is shifted to fifth bright fringe in the original pattern. The thickness of glass film isA. `2xx10^(-3)mm`B. `4xx10^(-3)mm`C. `6xx10^(-3)mm`D. `8xx10^(-3)mm`
Answer» Correct Answer - D `n lambda= (mu_(2)-mu_(1))t, 5beta= (mu_(2)-mu_(1))t(beta)/(lambda)`

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Angular width of central maxima in the Fraunhofer diffraction pattern of a slit is measured. The slit is illuminated by light of wavelength `6000Å`. When the slit is illuminated by light of another wavelength, the angular width decreases by 30%. The wavelength of this light will beA. `3500 Å`B. `4200 Å`C. `4700 Å`D. `6000 Å`
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