A monochromatic beam of light fall on YDSE apparatus at some angle (say `theta`) as shown in figure. A thin sheet of glass is inserted in front of the lower slit `s_(2)`. The central bright fringe (path difference `= 0`) will be obtained A. (a) At OB. (b) Above OC. (c) Below OD. (d) Anywhere depending on angle `theta`, thickness of plate t and refractive index of glass `mu`

A monochromatic beam of light fall on YDSE apparatus at some angle (sa

1.	A monochromatic beam of light fall on YDSE apparatus at some angle (say `theta`) as shown in figure. A thin sheet of glass is inserted in front of the lower slit `s_(2)`. The central bright fringe (path difference `= 0`) will be obtained A. (a) At OB. (b) Above OC. (c) Below OD. (d) Anywhere depending on angle `theta`, thickness of plate t and refractive index of glass `mu`
Answer» Correct Answer - D If `dsintheta=(mu-1)t`, central fringe is obtained at O If `dsinthetagt(mu-1)t`, central fringe is obtained above O and If `dsinthetalt(mu-1)t`, central fringe is obtained below O.

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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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