CBSE
Four independent waves are expressed as
(i) and (iii)
(i) and (iv)
(ii) and (iv)
not possible at all
Two coherent monochromatic light beams of intensities I and 4 I superimpose. The maximum and minimum possible intensities in the resulting beam are respectively
5I and I
5I and 3I
3I and I
9I and I
The intensity of sound gets reduced by 10% on passing through a slab. The reduction in intensity on passing through two consecutive slabs would be
20 %
19 %
5 %
50 %
A wavefront is represented by the plane y = 3-x. The propagation of the wave takes place at
45° with x direction
135° with x direction
60° with x direction
No sufficient data
The wavefront of a wave has direction with wave motion
parallel
perpendicular
opposite
at an angle of θ
When the angle of incidence is 60° on the surface of a glass slab, it is found that the reflected ray is completely polarised. The velocity of light in glass is
√2 x 108 ms-1
√3 x 108 ms-1
2 x 108 ms-1
3 x 108 ms-1
In Young's double-slit experiment with sodium vapor lamp of wavelength 589 nm and the slits 0.589 min apart, the half angular width of the central maximum is
sin-1(0.01)
sin-1(0.0001)
sin-1(0.001)
sin-1(0.1)
A beam of light of wavelength 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is
1.2 cm
1.2 mm
2.4 cm
2.4 mm
The specific rotation of a sugar solution is 0.5 deg m2/kg. 200 kg-m-3 of impure sugar solution is- taken in a sample polarimeter tube of length 20 cm and optical rotation is found to be 19°. The percentage of purity of sugar is
20%
80%
95%
89%
The intensity ratio of two coherent sources of light is P. They are interfering in the same region and produce an interference pattern. Then the fringe visibility is