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WorksheetsInterferometric measurement
Total questions: 20
Worksheet time: 30mins
Which of the following does not show any interference pattern?
Soap bubble
Excessively thin film
A thick film
Wedge Shaped film
The main principle used in Interference is _____________
Heisenberg’s Uncertainty Principle
Superposition Principle
Quantum Mechanics
Fermi Principle
When two waves of same amplitude add constructively, the intensity becomes _____________
Double
Half
Four Times
One-Fourth
Which of the following phenomena does NOT show a difference between the wave theory and particle theory of light?
reflection
refraction
interference
diffraction
If the β (the fringe width) is 0.0156 cm and the distance between the contact edge and the fibre ’l’ in an airwedge is 4 cm, then what is the thickness of the fibre subjected in the experiment? (λ of sodium vapor lamp = 589.3 nm.)
750 nm
75 μm
82 μm
7.5 μm
True or False: The interference pattern of soap bubble changes continuously.
True
False
Data Insufficient
Light is incident on a thin film which covers a mirrored surface. In this case, the processes which must occur to produce a bright reflection are
reflection, diffraction, interference
reflection, refraction, interference
diffraction and refraction only
refraction and reflection only
interference, polarization, refraction
The principle which allows a rainbow to form is
refraction
polarization
dispersion
total internal reflection
Two light sources are said to be coherent if they
are of the same frequency.
are of the same frequency, and maintain a constant phase difference.
are of the same amplitude, and maintain a constant phase difference.
are of the same frequency and amplitude.
On a clear day, the sky appears to be more blue toward the zenith (overhead) than it does toward the horizon. This occurs because
the atmosphere is denser higher up than it is at the earth's surface.
the temperature of the upper atmosphere is higher than it is at the earth's surface.
the sunlight travels over a longer path at the horizon, resulting in more absorption.
none of the above is true.
The image of the optical telescope is
Magnified ,inverted and virtual
Magnified ,inverted and real
Diminished, erect and virtual
Diminished, inverted and virtual
The angle of diffraction is
Half of angle between direct ray and spectral lines
Angle between reflected ray and direct ray
Angle between direct ray and spectral lines
Half of angle between reflected ray and direct ray
Example for three dimensional grating are
All crystals
solids with molecules which only transmit radiations
solids with molecules which only absorb radiations
solids with molecules which reflect all radiations
Source used for diffraction when a three dimensional grating (crystal) is used is
Microwave
X-rays
ultraviolet rays
Infrared rays
The difference between an interference pattern and diffraction pattern is
Intensity is same for all bright fringe in diffraction
Intensity is same for all bright fringe in interference
Intensity decreases when order of the spectrum increases in interference
Intensity increases when order of the spectrum increases in diffraction
Wavelength of spectral lines can be calculated from λ = ______.
Sin θ/Nm
Nm/Sin θ
N Sin θ/m
m Sin θ/N
When white light is replaced by sodium vapour lamp in a spectrometer experiment,
No fringes are formed
Spectral lines same as mercury vapour lamp are formed
same spectral lines are formed without white central spot
Bright and dark fringes are formed
The colour for this wavelength 5890 Å is
blue
bluegreen
red II
yellow
The least count of spectrometer is
1/2´
1/2´´
1´
2´
The purpose of collimator is to convert
Rays from the source to parallel rays
Rays from the source to diverging rays
Rays from the source to converging rays
None of these
