41.
There are two types of diffraction Fresnel and ..........
A
Fraunhofer
B
Huygens
C
Michelson
D
De Broglie
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There are two types of diffraction Fresnel and ..........
Fraunhofer
Huygens
Michelson
De Broglie
The wave nature of light is demonstrated by which of the following?
The speed of light
Diffraction
The photoelectric effect
Color
The speed of light in material A is 1.25 times as large as it is in material. What is the ratio of the refractive indices, µA /µB of these materials?
0.8
1.25
1.5
1
The speed of any mechanical wave as it propagates through a medium is dependent mainly on the
period of the wave
type of medium through which the wave travels
frequency of the wave source
wavelength
The region of the electromagnetic spectrum immediately above the frequencies to which the human eye is sensitive is called
RF
Gamma ray
IR
Ultra-Violet
The Radius (or diameter) of dark rings in Newtons rings is
Directly proportional to the square root of even numbers
Directly proportional to the square root of natural numbers
Directly proportional to the square root of odd numbers
Inversely proportional to the square root of natural numbers
The Radius (or diameter) of bright rings in Newtons rings is
Directly proportional to the square root of odd numbers
Inversely proportional to the square root of natural numbers
Directly proportional to the square root of even numbers
Directly proportional to the square root of natural numbers
The principle on which fiber optics is based is
refraction
polarization
Dispersion.
Total internal reflection
The points of constructive interference of light are
Always bright
may be bright or dark
always dark
neither bright nor dark
The phenomenon of Newtons rings can be used to check the
Wavelength of monochromatic light
phase coherence of two sources
flatness of any glass surface
velocity of light
The phenomenon of diffraction can be understood using
Huygens principle
Fraunhofer
Uncertainty principle
Fresnel
The number of lines on plane gratings is 5000. If it is illuminated by a wavelength of light 6000 Ao, how many orders will be visible?
3
3.33
4
2
The interference in thin films is because
The film reflects some light
The film is thin enough so that refracted ray is close to reflected ray
All of above
The grating used to observe, diffraction of visible light can have approximately
300 lines per cm
3000 lines per cm
15000 lines per cm
30 lines per cm
The first reflecting telescope was built by
Galileo
Copernicus
Tyco Brahe
Isaac Newton
The diffraction observed by diffraction grating can also be termed as
Single slit diffraction
double slit Diffraction
multiple Slit Diffraction
Fresnels Diffraction
The dark lines constituting the absorption spectrum exhibited by sunlight are frequently called
Fresnel lines
Fraunhofer lines
Fermi lines
Franklin lines
The critical angle for a beam of light passing from water into air is 48.8 degree. This means that all light rays with an angle of incidence greater than this angle will be
absorbed
totally reflected
Partially reflected and partially transmitted
Totally transmitted
The conditions for the production of constructive and destructive interference are reversed due to the fact that on striking the thin film
Two rays of splitted light undergo phase change of 180 degree
One of two rays of splitted light undergo phase change of 180 degree
Light is diffracted, light is polarized
The characteristic that distinguishes a laser beam from an ordinary light beam is
The greater frequency of the laser beam
The coherence of the laser beam
The color of the laser beam
The greater polarization of the laser beam