To make the central fringe at the center`O` , mica sheet of refractive index `1.5` is introduced Choose the corect statement. A. The thickness of sheet is `(d^(2))/(D)` in front of `S_(1)`B. The thickness of sheet is `(d^(2))/(D)` in front of `S_(2)`C. The thickness of sheet is `(d^(2))/(2D)` in front of `S_(1)`D. The thickness of sheet is `(d^(2))/(2D)` in front of `S_(1)`

To make the central fringe at the center`O` , mica sheet of refractive

1.	To make the central fringe at the center`O` , mica sheet of refractive index `1.5` is introduced Choose the corect statement. A. The thickness of sheet is `(d^(2))/(D)` in front of `S_(1)`B. The thickness of sheet is `(d^(2))/(D)` in front of `S_(2)`C. The thickness of sheet is `(d^(2))/(2D)` in front of `S_(1)`D. The thickness of sheet is `(d^(2))/(2D)` in front of `S_(1)`
Answer» Correct Answer - A

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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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