WorksheetsWave Optics
Total questions: 18
Worksheet time: 36mins
According to Brewster's law, at polarising angle, the reflected and refracted rays are
parallel to each other.
antiparallel to each other.
perpendicular to each other.
at 40° to each other.
If the polarising angle for a given medium is 60°, then the refractive index of the medium is
31
3÷2
1
3
The angle of incidence at which the polarisation of light reflected from the surface of glass occurs is 58º. The refractive index of glass is
1.9
1.8
1.7
1.6
Glass plate of refractive index 1.732 is to be used as a polariser, its polarising angle is
30°
45°
60°
90°
To demonstrate the phenomenon of interference, we require
two sources which emit radiation of same frequency.
two sources which emit radiation of nearly same frequency.
two sources which emit radiation of the same frequency and have a definite phase relationship
two sources which emit radiation of different wavelength.
For destructive interference,
crest of one wave coincides with trough of other.
trough of one wave coincides with trough of the other.
crest of one wave coincides with crest of other.
formation of crest and trough is not necessary.
To produce constructive interference at a point, the path difference between two waves superposing at the point should be
Δ x = 0, λ, 2λ, 3λ.....nλ
Δ x = λ, 3λ, 5λ .....(2n −1)λ
For constructive interference, the phase difference between two waves should be
0, 2π , π ,....
0, 2π, 4π....
π, 3π, 5π....
4π, 2π, 43π
The centre of interference pattern is
always bright.
always dark.
may be bright or dark.
brightness changes continuously.
In a double slit experiment, instead of taking slits of equal widths, one slit is made twice as wide as the other. Then, in the interference pattern
the intensities of both the maxima and the minima increases.
the intensity of the maxima increases and the minima has zero intensity.
the intensity of the maxima decreases and that of the minima increases.
the intensity of the maxima decreases and the minima has zero intensity.
Which of the following phenomenon proves that light is a transverse wave?
Reflection
Interference
Diffraction
Polarization
Which property of light does not change when it travels from one medium to another?
Velocity
Wavelength
Amplitude
Frequency
In Young's double slit experiment, the two coherent sources have different intensities. If the ratio of maximum intensity to the minimum intensity in the interference pattern produced is
25:1. What was the ratio of intensities of the two
5:1
25:1
3:2
9:4
In Young's double slit experiment, a thin uniform sheet of glass is kept in front of the two slits, parallel to the screen having the slits. The resulting interference pattern will satisfy:
The interference pattern will remain unchanged
The fringe width will decrease
The fringe width will increase
The fringes will shift.
The __________ is equal to the ratio of the speed of light in vacuum (c) to the speed of light in the medium (v).
wavefront
permittivity
refractive index
permeability
The refractive index of _________ is 1 and that of can be approximated to be 1.
vacuum, air
air, vacuum
air, glass
air, water
In vacuum optical path is
equal to actual path travelled.
less than actual path travelled.
greater than actual path travelled.
infinite.
Two waves interfere constructively when their optical path lengths ___________
are unequal
are equal or differ by integral multiples of wavelength.
are equal or differ by even integral multiples of wavelength.
are equal or differ by odd integral multiples of wavelength.
