21.
Which of the following phenomenon produces colors in soap bubble?
A
Interference
B
Diffraction
C
Polarization
D
Dispersion
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Which of the following phenomenon produces colors in soap bubble?
Interference
Diffraction
Polarization
Dispersion
Which of the following phenomenon cannot be explained on the particle nature of light
Photo Electric Effect
Comptons Effect
Pair Production
Interference
Which of the following does NOT travel in a vacuum?
Radio waves
Gamma rays
Magnetic waves
Sound waves
Which of the following does not support the wave nature of light
Interference
Compton effect
Polarisation
Diffraction
Which of the following condition is essential for observing Fraunhofer diffraction?
Source must be close to slit and screen should be at infinite distance
Both source and screen must be close to slit
Source must be at infinity and screen should be close to the slit
Both source and screen must be at infinity
When Newtons rings interference pattern is viewed from above by means of reflected light, the central spot is
Dark
Multi colored
Bright
None of these
When light passes from air into water, the frequency of the light remains the same. What happens to the speed? And the wavelength of light as it crosses the boundary in going from air into water? Speed Wavelength
Increases Remains the same
Remains the same Decreases
Remains the same remains the same
Decreases Decreases
When electromagnetic waves strike the boundary of denser medium they are
Reflected, in phase
Reflected out of phase by 180 degree
reflected, they are completely absorbed
When a light wave suffers reflection at the interface between air and glass medium, the change of phase of the reflected wave in air is equal to
pi
2pi
pi/2
When a light wave suffers reflection at the interface between air and glass medium, the change of phase of the reflected wave in air is equal to
pi
2 pi
pi /2
When a light ray travelling in glass is incident on an air surface
it will refract away from the normal
some of the light may be reflected
all of the light may be reflected
all of A, B, and C
What is true for intensity of scattered light according to Rayleighs law?
The intensity for scattering for light of largest wavelength more
The light of smallest wavelength will be scattered more
All the wavelengths are scattered equally
Intensity of light is not affected by scattering
What is the speed of light in glycerin (n = 1.47) expressed in terms of the speed of light in a vacuum?
0.680c
1.00c
2.04c
1.47c
What is the nature of interference pattern for thin film of wedge shaped
Equally spaced
Concave inside
Concave outside
Convex outside
What is the nature of interference pattern at the contact edge of wedge shaped film
Bright or dark depending upon the thickness of other end
Bright or dark depending upon the wavelength of the light
Always bright
Always dark
What is the name of the process whereby waves travel around corners and obstacles in their paths?
Interference
Diffraction
Reflection
Refraction
What is the highest order spectrum which may be seen with monochromatic light of wavelength 5000 Ao by means of diffraction grating with 5000 lines/cm?
8
16
2
4
What is the effect of increasing the number of slits on the intensity of Central maxima of diffraction pattern of a diffraction grating?
There will not be any effect
Diffraction pattern will disappear
Intensity of central maxima will decrease
Intensity of central maxima will increase
Two sources of light are said to be coherent if
they produce waves in the medium simultaneously
they produce waves of the same amplitude
they produce waves of the same wave length
they have the same amplitude of vibration
To find prominent diffraction, the size of diffraction object should be
less than wavelength of light used
none of these
greater than wavelength of light used
comparable to order of wavelength of light