The wavefront of a wave has direction with wave motion
parallel
perpendicular
opposite
at an angle of θ
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%
C.
95%
The strength of the solution is given by
where the symbols have their usual meanings.
Here,
θ = 19°, l = 20 cm = 0.20 m,
s = 0.5 deg m2/kg.
The sugar sample dissolved in a m3 of water is 200 kg in which 190 kg is pure sugar. Therefore, purity is
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)
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
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 %
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
Ordinary light incident on a glass slab at the polarising angle suffers a deviation of 22°. The value of the angle of refraction in glass in this case is
56°
68°
34°
22°
Which one of the following does not support the wave nature of light?
Photoelectric effect
Interference
Polarization
Diffraction