81.
Interference in thin film is mainly because of
A
Division amplitude
B
Division of wave fronts
C
Addition of amplitude
D
Addition of wave fronts
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Interference in thin film is mainly because of
Division amplitude
Division of wave fronts
Addition of amplitude
Addition of wave fronts
In wedge shaped film the interference pattern has nature
Parallel to the end where thickness is non-zero
Perpendicular to contact edge
Parallel to contact edge
Perpendicular to the end where thickness is non-zero
In thin film of wedge shaped, by keeping all other parameters constant, if only wavelength of incident light is increased. What will be the effect on bandwidth?
Bandwidth increases
Bandwidth decreases
Bands will merge
There will not any effect
In reflected light the central fringes of Newtons ring is
dark
Bright
Uniform
Non uniform
In reference with antireflection coating which of the following statement is true?
Thickness of the film should be changed for light of same wavelength but different intensity
Thickness of the film need not be changed for light of same wavelength but different intensity
Thickness of the film should be increased for light of same wavelength but higher intensity
Thickness of the film should be decreased for light of same wavelength but higher intensity
In plane transmission grating, the angle of diffraction for second order maxima for wavelength 5 x 10-5 cm is 30 degree. Calculate the number of lines in one centimeter of the grating surface
1000 lines/cm
5000 lines/cm
500 lines/cm
10000 lines/cm
In Newtons rings the central spot is
Always bright
always dark
can be bright or dark
of blue color
In Newtons rings experiment, if we reduce the radius of curvature of PlanoConvex lens to zero, what will be effect on Newtons rings?
They will become more bright
They will become more dark
They will disappear
They will be more dense
In Newtons rings experiment, if we reduce the radius of curvature of Plano convex lens to zero, what will be effect on Newtons rings?
They will become brighter
They will become darker
They will disappear
They will be more dense
In Newtons rings experiment, if monochromatic source of light is replaced by another monochromatic source of higher wavelength. What will be the effect on radius (or diameter)?
Radius (or diameter) will decrease
Radius (or diameter) will increase
There will be no effect
Radius (or diameter) will remain constant but there will be more brightness
In Newtons Ring experiments, the diameter of dark rings is proportional to
Odd Natural numbers
Natural Number
Even Natural Number
Square root of natural number
In Newtons Ring experiments, the diameter of bright rings is proportional to
Square root of Odd Natural numbers
Natural Number
Even Natural Number
Square root of natural number
In Newtons ring experiment, the diameter of the 15 th ring was found to be 0.590 and that of the 5th ring was 0.336 cm. If the radius of Plano convex lens is 100 cm, compute the wavelength of light used
5885 Ao
5880 Ao
5890 Ao
5850 Ao
In Michelson s interferometer 100 fringes cross the field view when the movable mirror is displaced through 0.0248 mm. Calculate the wavelength of monochromatic light used
5896 Ao
5890 Ao
4000 Ao
4890 Ao
In Michelson interferometer semi silvered mirror is used to obtain
Thin film interference
Phase coherence
mono chromatic light
colored fringe
In interference experiment, monochromatic light is replaced by white light, we will see
Uniform illumination of screen
Uniform darkness on the screen
Equally spaced dark and white bands
Few colored bands and then general illumination
In interference experiment, by keeping all other parameters constant, if you see the thin film interference from different angles, you will observe
Uniform illumination of screen
Uniform darkness on the screen
Equally spaced dark and white bands
Few colored bands and then general illumination
In Fresnel diffraction
source of light is kept at infinite distance from the aperture
source of light is kept at finite distance from the aperture
Convex lens used
aperture width is selected so that it can acts as a point source
In Fraunhofer diffraction, the incident wave front should be
elliptical
Plane
Spherical
Cylindrical
In Fraunhofer diffraction wave front used is
Spherical
Circular
Plane
Conical