In YDSE with light of wavelength the separation of slits is d and distance of screen is D such that D >> d>>. If the fringe width is , the distance from point of maximum intensity to the point where intensity falls to half to half of maximum intensity on either side is :
1.
2.
3.
4.
A single slit of width 0.1 mm is illuminated by a parallel beam of light of wavelength 6000 and diffraction bands are observed on a screen 0.5 m from the slit. The distance of the third dark band from the central bright band is :
1. 3mm
2. 9mm
3. 4.5 mm
4. 1.5 mm
In YDSE shown in figure S1 and S2 are coherent sources and S is the screen having a hole at a point 1.0 mm away from the central line. White light (400 to 700 nm) is sent through the slits. Which wavelength passing through the hole has strong intensity ?
1. 400 nm
2. 700 nm
3. 500 nm
4. 667 nm
The central fringe of the interference pattern produced by light of wavelength 6000 is found to shift to the position of 4th bright fringe after a glass plate of refractive index 1.5 is introduced in front of one of slits in Young's experiment. The thickness of the glass will be
1. 4.8
2. 8.23
3. 14.98
4. 3.78
IN YDSE the two slits are illuminated by light of wavelength 5890 and the distance between the fringes obtained on the screen is 0.2. If the whole apparatus is immersed in water then the angular fringe width will be, if the refractive index of water is 4/3
1. 0.30
2. 0.15
3. 15
4. 30
In a double slit experiment, the two slits are 1 mm apart and the screen placed 1 m away. A monochromatic light wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double slit within the central maxima of single pattern ?
1. 0.1 mm
2. 0.5 mm
3. 0.02 mm
4. 0.2 mm
In a Young's double slit experiment, the two slit acts as coherent sources of wave of equal amplitude A and wavelength . In another experiment with the same arrangement the two slits are made to act as incoherent sources of waves of same amplitude and wavelength. If the intensity at the middle point of the screen in the first case is and in the second case , then the ratio is
1. 2
2. 1
3. 0.5
4. 4
In the figure is shown Young's double slit experiment. Q is the position of the first bright fringe on the right side of O, P is the 11th fringe on the other side, as measured from Q. If the wavelength of the light used is , then is equal to
1.
2.
3.
4.
In YDSE, slits are separated by 0.5 mm, and the screen is placed 150 cm away. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide is :
1. 9.75 mm
2. 15.6 mm
3. 1.56 mm
4. 7.8 mm
Light of wavelength 550 nm falls normally on a slit of width . The angular position of the second maxima from the central maximum will be (in radians)
1.
2.
3.
4.
A beam of light consisting of two wavelengths 6500 & 5200 is used to obtain interference fringes in a Young's double slit experiment. The distance between the slits is 2.0 mm and the distance between the plane of the slits and the screen is 120 cm. What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide ?
1. 0.156 cm
2. 0.152 cm
3. 0.17 cm
4. 0.16cm
In Young's double slit interference experiment, the distance between two sources is 0.1 / mm. The distance of the screen from the source is 25 cm. Wavelength of light used is 5000 . Then the angular position of the first dark fringe is
1. 0.10
2. 0.15
3. 0.30
4. 0.45
The wavefronts of a light wave travelling in vacuum are given by x+y+z =c. The angle made by the direction of propagation of light with the X-axis is
1. 0
2. 45
3. 90
4.
Figure shows wavefront P passing through two systems A and B and emerging as Q and then as R. The system A and B could, respectively, be
1. a prism and a convergent lens
2. a convergent lens and a prism
3. a divergent lens and a prism
4. a convergent lens and a divergent lens
For the two parallel rays AB and DE shown here, BD is the wavefront. For what value of wavelength of rays ,destructive interference takes place between ray DE and reflected ray CD ?
1.
2.
3. x
4. 2x