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9,374 Questions
CBSE
#1 Class 12 Physics Wave Optics 2022 Long 1M
Assertion (A): Two light sources emitting waves of similar wavelengths are coherent. Reason (R): Two light sources emitting waves having zero or constant phase difference are known as coherent sources.
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CBSE
#2 Class 12 Physics Wave Optics 2022 Mcq 1M
When the slit width in a single-slit diffraction experiment is increased (keeping source intensity same), which graph correctly shows the new intensity pattern?
A. Central maximum becomes narrower and brighter
B. Central maximum becomes wider and dimmer
C. No change
D. Central maximum becomes narrower and dimmer
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CBSE
#3 Class 12 Physics Wave Optics 2020 Mcq 1M
A single slit of width 0.5 mm is illuminated by parallel light of wavelength 5000 Å. The diffraction pattern is observed on a screen 1 m away. The width of the central maximum is
A. 500 mm
B. 600 mm
C. 700 mm
D. 2 mm
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CBSE
#4 Class 12 Physics Wave Optics 2021 Mcq 1M
In Young's experiment, if a thin transparent glass plate is introduced normally in one of the beams, then
A. fringes will disappear
B. fringe width will increase
C. fringe width will decrease
D. fringe width remains the same but pattern shifts
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CBSE
#5 Class 12 Physics Wave Optics 2020 Mcq 1M
When a compact disc is illuminated by white light, coloured lanes are observed. This is due to
A. dispersion
B. diffraction
C. interference
D. refraction
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CBSE
#6 Class 12 Physics Wave Optics 2018 Mcq 1M
The bending of a beam of light around the corners of an obstacle is called
A. reflection
B. refraction
C. diffraction
D. interference
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CBSE
#7 Class 12 Physics Wave Optics 2019 Mcq 1M
In Young's double slit experiment, for which colour is the fringe width the least?
A. green
B. red
C. blue
D. yellow
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CBSE
#8 Class 12 Physics Wave Optics 2021 Mcq 1M
What happens if monochromatic light in Young's double slit experiment is replaced by white light?
A. no fringes are observed
B. all bright fringes become white
C. all bright fringes are coloured between violet and red
D. only central fringe is white and all other fringes are coloured
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CBSE
#9 Class 12 Physics Wave Optics 2020 Mcq 1M
Interference takes place due to change in
A. velocity
B. intensity
C. amplitude
D. phase difference
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CBSE
#10 Class 12 Physics Wave Optics 2019 Mcq 1M
If light waves emitted by two coherent sources have wavelengths $\lambda_A$ and $\lambda_B$, then
A. $\lambda_A = \lambda_B$
B. $\lambda_A > \lambda_B$
C. $\lambda_A < \lambda_B$
D. None of these
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CBSE
#11 Class 12 Physics Wave Optics 2020 Mcq 1M
In Young's double slit experiment, interference was observed with air present. If the chamber is evacuated and the same light is used, we will see
A. no interference
B. interference with dark bands
C. interference with bright bands
D. interference with increased fringe width
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CBSE
#12 Class 12 Physics Wave Optics 2021 Mcq 1M
In Young's double slit experiment, if one slit is covered with a red filter and the other with a green filter, the interference pattern will be
A. red
B. green
C. yellow
D. invisible
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CBSE
#13 Class 12 Physics Wave Optics 2020 Mcq 1M
When exposed to sunlight, thin films of oil on water exhibit brilliant colours due to the phenomenon of
A. interference
B. diffraction
C. dispersion
D. polarisation
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CBSE
#14 Class 12 Physics Wave Optics 2011 Mcq 1M
Bright colours exhibited by a spider's web exposed to sunlight are due to
A. diffraction
B. polarisation
C. interference
D. resolution
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CBSE
#15 Class 12 Physics Wave Optics 2018 Mcq 1M
In Huygens' wave theory, the locus of all points oscillating in the same phase is called a
A. ray
B. vibrator
C. wavefront
D. half period zone
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CBSE
#16 Class 12 Physics Wave Optics 2019 Mcq 1M
The inverse square law of intensity (illuminance) is valid for
A. plane wavefront
B. conical wavefront
C. spherical wavefront
D. cylindrical wavefront
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CBSE
#17 Class 12 Physics Wave Optics 2020 Mcq 1M
Huygens' wave theory of light cannot explain
A. diffraction
B. interference
C. polarisation
D. photoelectric effect
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CBSE
#18 Class 12 Physics Wave Optics 2019 Mcq 1M
The colour of a thin film is due to
A. scattering
B. interference
C. dispersion
D. diffraction
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CBSE
#19 Class 12 Physics Wave Optics 2021 Mcq 1M
In a Young's double-slit experiment in air, the fringe width is found to be 0.44 mm. If the entire setup is immersed in water ($n = 4/3$), the fringe width will be
A. 0.88 mm
B. 0.59 mm
C. 0.33 mm
D. 0.44 mm
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CBSE
#20 Class 12 Physics Ray Optics and Optical Instruments 2020 Short 2M
What is the new focal length of a convex lens when it is cut (a) vertically and (b) horizontally?
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