21.
The shape of E -wave front is
A
plane
B
spherical
C
elliptical
D
cylindrical
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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
The method of achieving population inversion in He – Ne Laser is
Optical pumping
inelastic Scattering
forward biasing
chemical reaction
The material in which the population inversion is achieve is called as
Active medium
metastable state
passive medium
stable states
The He - Ne laser is
Continuous Laser
gas Laser
semiconductor laser
pulsed laser
The coherence length of Laser light is
4000 Amstrong
8000 Amstrong
300 m
2 µm
The acute angle between the planes of crystal is
78 degree
71 degree
102 degree
109 degree
Ruby laser produces the laser beam of wavelength
6943 Amstrong
6328 Amstrong
6320 Amstrong
6940 Amstrong
Principle planes in calcite crystals are
squares
rhombus
triangles
parallelograms
Plane of vibration is defined only for
plane polarised
unpolarised
both plane polarised & unpolarised
neither plane polarised & nor unpolarised
Optic axis is
an imaginary line inside the crystal
a real line inside the crystal
a real direction inside the crystal
none of these
O and E waves travel with the same velocity...............in the crystal
parallel to the surface
Perpendicular to the surface
along optic axis
none of the above
Laser radiation is
Monochromatic
Directed in a narrow beam
Produced with large power densities
All of the above