In a YDSE, fringes are produced by monochromatic light of wavelength 5450Å. A thin plate of glass of refractive index 1.5 is placed normally in the path of one of the intefering beams and the central bright band of the fringe system is found to move into the position previoysly occupied by the third band from the centre. select the correct alternatieA. The thickness of the plate is `3.27xx10^(-6)m`B. If the separation between the sources is `1000Å` , the angular position of first maxima is 0.01 radC. The thickness of the plate is `1.59xx10^(-6)m`D. A maxima is still obtained at the centre of screen

In a YDSE, fringes are produced by monochromatic light of wavelength 5

1.	In a YDSE, fringes are produced by monochromatic light of wavelength 5450Å. A thin plate of glass of refractive index 1.5 is placed normally in the path of one of the intefering beams and the central bright band of the fringe system is found to move into the position previoysly occupied by the third band from the centre. select the correct alternatieA. The thickness of the plate is `3.27xx10^(-6)m`B. If the separation between the sources is `1000Å` , the angular position of first maxima is 0.01 radC. The thickness of the plate is `1.59xx10^(-6)m`D. A maxima is still obtained at the centre of screen
Answer» Correct Answer - A::D

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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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