67 practice sets · Page 3 of 4
LASER is a short form of
Light Amplification by Spontaneous Emission of Radiation.
Light Amplification by Stimulated Emission of Radiation.
Light Absorption by Stimulated Emission of Radiation.
Light Absorption by Spontaneous Emission of Radiation.
Laser beam is made a of
Electrons
Highly coherent photon
Elastic particles
Excited atoms
In the population inversion
The number of electrons in higher energy state is more than ground state
The number of electrons in lower energy state is more than higher energy state
The number of electrons in lower energy state and higher energy state are same
None of them
In optics, when the vibrations of light are limited to a single two dimensional plane, it is said that light has been what?
Polarised
Plane polarised
Partially polarised
Unpolarised
In double refraction, the vibrations of E ray are confined in
Plane perpendicular to the principle section
Principle section
at an angle ? to the principle section
keeps on changing orientation
In a semiconductor laser, the doping concentration is so high that the Fermi level in N type diode lies
Center of energy gap
Top of valence band
Bottom of conduction band
Inside the conduction band
If the light is made incident on any transparent medium at the polarizing angle, the transmitted light is
unpolarised
Plane polarised
partially Polarised
none of these
If the light is made incident on any transparent medium at the polarizing angle, the reflected light is
unpolarised
Plane polarised
partially Polarised
none of these
If the light is incident on a transparent material at the polarizing angle of 60 degree, The angle of refraction is
45 degree
60 degree
30 degree
90 degree
If the angle between the axis of Polarizer and analyser is 90 degree, the intensity of light transmitted by analyser is.............times the intensity transmitted by the polarizer
2-Jan
4-Mar
4-Jan
Zero
If the angle between the axis of Polarizer and analyser is 45 degree , the intensity of light transmitted by analyser is...................times the intensity transmitted by the polarizer
2-Jan
4-Mar
4-Jan
Zero
If the angle between the axis of Polarizer and analyser is 300, the intensity of light transmitted by analyser is........times the intensity transmitted by the polarizer
2-Jan
4-Mar
4-Jan
Zero
If a hologram is illuminated by white light it will form
Single color image
Colorful image
will not form image
red image in black and white
How much phase change is introduced by a quarter wave plate between ordinary and extra ordinary ray.
pi
2 pi
pi/2
pi/4
How many principle sections of uniaxial crystal have?
6
3
5
2
Electric field vector vibrates in only one plane and perpendicular to the direction of propagation in.............light
plane polarised
unpolarised
both plane polarised & unpolarised
neither plane polarised & nor unpolarised
Dextrorotatory optically active substance rotates the plane of vibration?
In clockwise direction
In anticlockwise direction
By 180 degree
none of these
An optical fiber cable acts as the principle of
Double refraction
Total external refraction
reflection
total internal reflection
A semiconductor diode Laser is
Four level
Three level
Two level
one level
A quarter of a wavelength is equal to how many degrees of phase?
90
45
60
180
