Multiple Choice QuestionsThe slit width, when a light of wavelength 6500 Å is incident on a slit, if first minima for red light is at 30°, is :
1 × 10-6 m
5.2 × 10-6 m
1.3 × 10-6 m
2.6 × 10-6 m
In single slit diffraction pattern
central fringe has negligible width than others
all fringes are of same width
central fringe does not exist
none of the above
The ratio of intensities of two waves is 1: 9. The waves interference, what will be the ratio of maximum and minimum intensities?
1:4
4:1
3:2
2:3
Two coherent monochromatic light beams of intensities I and 9I are superimposed.The maximum and the minimum intensities of the resultant beams are
10 I and zero
10 I and 8 I
10 I and 4 I
16 I and 4 I
In a single slit diffraction pattern, the distance between the first minimum on the left and the first minimum on the right is 5 mm. The screen on which the diffraction pattern is displayed is at a distance of 80 cm from the slit. The, wavelength is 6000 A. The slit width (in mm) is about
0.576
0.348
0.192
0.096
To demonstrate the phenomenon of interference we require two sources which emit radiations of
nearly the same frequency
the same frequency
different wavelengths
the same frequency and having a definite phase relationship
In Young's experiment, the wavelength of red light is 7800 and that of blue light is 5200 . The value of n for which (n + 1)th blue band coincides with nth red band is
1
2
3
4
The phenomenon of polarization of light indicates that
light is a longitudinal waves
light is transverse wave
light if not a wave
light travels with the velocity of 3x 108 m/s
In Young's double slit experiment one slit is covered with red filter and another slit is covered by green filter, then interference pattern will be
red
green
yellow
invisible
In Young's experiment, if separation between slits is made half, then fringe width will become
double
four times
half
remains same
