1.
A optically active material
A
changes the direction of propagation of light
B
changes the direction of reflected light
C
changes the intensity of reflected light
D
changes the direction of the plane of polarization
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A optically active material
changes the direction of propagation of light
changes the direction of reflected light
changes the intensity of reflected light
changes the direction of the plane of polarization
Zone plate has some similarities as well as some differences with a
Plano convex lens
Concave lens
grating
Convex lens
Which waves travels with the same velocity in all directions
O
E
O and E
Neither O nor E
Which waves travels with the different velocity in different directions
O
E
O and E
Neither O nor E
Which one is the example of uniaxial crystal?
Calcite
Tourmaline
Quartz
all of them
Which of the laser have very low efficiency
Ruby
Semiconductor
He- Ne
Ammonia gas laser
Which of the laser have high efficiency
Ruby
Semiconductor
He - Ne
Co2
Which of the following phenomena suggest that light may be a transverse wave?
Reflection
Polarisation
Photoelectric effect
Diffraction
Which is the following used to convert Unpolarised light into polarised light
Nicol Prism
Calcite prism
Tourmaline crystal
None of the above
When the light is incident at the polarizing angle which of the following completely polarised
Reflected light
Refracted light
both
neither reflected Nor Refracted
When light travels parallel to the optic axis
double refraction is observed
double refraction is not observed
Path difference between O and E waves
Both B and C.
When a beam of ordinary white light is passed through a Polaroid plate filter, the intensity of the beam that emerges is
Equal to that of the incident beam
About 0.9 that of the incident beam
About one-half that of the incident beam
Practically zero
What is the wavelength of red light emitted by a helium-neon laser?
122 nanometers
633 nanometers
2.43 nanometers
1.37 micrometers
What is the life time of electron in metastable state?
sec
Sec
sec
sec
What happen to O and E rays if they travel along the optic Axis?
Both ray travel with the same velocity
O ray travels faster than E ray
E ray travel faster than O ray
none of these
What happen if the ordinary unpolarised light is passed through a Uniaxial crystal
light is split into two rays
Light remain unaffected
light is split into more than two rays
None of them
The waves forming ordinary image are
plane polarised
unpolarised
partially polarised
any of above
The thickness of crystal in an LCD is chosen so that it rotates the plane of vibration of plane polarized light by
45 degree
90 degree
30 degree
60 degree
The Specific rotation is
independent of wavelength
directly proportional to wavelength
inversely proportional to wavelength
inversely proportional to square wavelength
The shape of O -wave front is
plane
spherical
elliptical
cylindrical