121.
When the light is incident at the polarizing angle which of the following completely polarised
A
Reflected light
B
Refracted light
C
both
D
neither reflected Nor Refracted
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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
The shape of E -wave front is
plane
spherical
elliptical
cylindrical
The Ruby laser is
Continuous Laser
gas Laser
semiconductor laser
pulsed laser
The property of rotating the plane of vibration of plane polarized light is known as
double refraction
optical activity
polarization
Dichroism
The plane in which the magnetic field vector of plane polarised light vibrates is known as
Plane of vibration
Plane of Polarisation
Principal Plane
None of above
The plane in which the electric field vector of plane polarised light vibrates is known as
Plane of vibration
Plane of Polarisation
principal Plane
None of above
The obtuse angle between the planes of crystal is
78 degree
71 degree
102 degree
109 degree
The Nicol prism based on the action of
reflection
Double refraction
refraction
scattering
The method of population inversion to the laser action in He-Ne laser is
molecule collision
direction conversion
electric discharge
electron impact
The method of achieving population inversion in Ruby Laser is
Optical pumping
inelastic Scattering
forward biasing
chemical reaction