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#1 Class 12 Physics Wave Optics 2020 Short 2M CBSE
When a tiny circular obstacle is placed in the path of light from a distant source, a bright spot is seen at the centre of the shadow. Explain.
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#2 Class 12 Physics Wave Optics 2019 Short 2M CBSE
Light from two coherent sources reaches a screen. If the path difference at a point for yellow light is $\frac{3\lambda}{2}$, what will be the colour of the fringe at that point?
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#3 Class 12 Physics Wave Optics 2019 Short 2M CBSE
Can two electric bulbs of the same power and same material placed close to each other produce interference on a screen? Give reason.
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#4 Class 12 Physics Wave Optics 2020 Short 2M CBSE
What happens to the interference pattern when two coherent sources are: (a) infinitely close to each other, and (b) far apart from each other?
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#5 Class 12 Physics Wave Optics 2022 Short 3M CBSE
In Young's Double Slit Experiment, the two slits have width ratio 4:1. Find the ratio of intensity at maxima to minima in the interference pattern.
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#6 Class 12 Physics Wave Optics 2023 Long 1M CBSE
Assertion (A): In Young's double slit experiment, if slit separation $d$ and screen distance $D$ are both reduced to $1/3$, the fringe width remains the same. Reason (R): Fringe width is proportional to $d/D$.
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#7 Class 12 Physics Wave Optics 2021 Short 2M CBSE
In a Young's double slit experiment, the path difference at a point on the screen between two interfering waves is $\frac{\lambda}{8}$. Find the ratio of intensity at this point to that at the centre of a bright fringe.
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#8 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
The diffraction effect can be observed in
A. sound waves only
B. light waves only
C. ultrasonic waves only
D. sound waves as well as light waves
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#9 Class 12 Physics Wave Optics 2022 Long 1M CBSE
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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#10 Class 12 Physics Wave Optics 2022 Mcq 1M CBSE
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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#11 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
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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#12 Class 12 Physics Wave Optics 2021 Mcq 1M CBSE
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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#13 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
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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#14 Class 12 Physics Wave Optics 2018 Mcq 1M CBSE
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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#15 Class 12 Physics Wave Optics 2019 Mcq 1M CBSE
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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#16 Class 12 Physics Wave Optics 2021 Mcq 1M CBSE
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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#17 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
Interference takes place due to change in
A. velocity
B. intensity
C. amplitude
D. phase difference
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#18 Class 12 Physics Wave Optics 2019 Mcq 1M CBSE
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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#19 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
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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#20 Class 12 Physics Wave Optics 2021 Mcq 1M CBSE
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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