A monochromatic beam of light is used for the formation of fringes on a screen by illuminating the twoslits in the Young,s double slit interfrence experiment. When a thin film of mic is interposed in the path of one of the interfering beamsA. the fringe-width increasesB. the fringe-width decreasesC. the fringe pattern disappearsD. fringe-width remains the same but the pattern shifts

A monochromatic beam of light is used for the formation of fringes on

1.	A monochromatic beam of light is used for the formation of fringes on a screen by illuminating the twoslits in the Young,s double slit interfrence experiment. When a thin film of mic is interposed in the path of one of the interfering beamsA. the fringe-width increasesB. the fringe-width decreasesC. the fringe pattern disappearsD. fringe-width remains the same but the pattern shifts
Answer» Correct Answer - D Shift `= (mu -1) (tbeta)/(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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