Wave optics: Huygens’ principle, interference and diffraction - One Line Questions
1.
The intensity of light in an interference pattern varies between: —
0 and I_max
2.
If two coherent sources of light have intensities in the ratio 1:9, then the ratio of amplitudes of the waves is: —
1:3
3.
In single-slit diffraction, the angular width of the central maximum is given by: —
2λ/a
4.
The intensity ratio of the brightest to the darkest fringe in Young's double-slit experiment, if the intensities of the two sources are I₀ and 9I₀, is: —
16:1
5.
For destructive interference, the path difference between two light waves should be: —
An odd multiple of λ/2
6.
The condition for the nth secondary maximum in single-slit diffraction is approximately: —
a sin θ = (n+1/2)λ
7.
The condition for the nth minimum in single-slit diffraction is given by: —
a sin θ = nλ
8.
The resultant amplitude in interference when two waves of amplitudes A₁ and A₂ interfere constructively is: —
A₁ + A₂
9.
The resultant amplitude in interference when two waves of amplitudes A₁ and A₂ interfere destructively is: —
A₁ - A₂
10.
The condition for constructive interference of two light waves is that the path difference between them should be: —
A multiple of λ
11.
In the Fresnel diffraction experiment, the source and screen are: —
At finite distances from the aperture
12.
In the Fraunhofer diffraction experiment, the source and screen are: —
At infinite distances from the aperture
13.
Diffraction of light is the phenomenon of: —
Bending of light around obstacles
14.
When white light is used in Young's double-slit experiment, the fringes on either side of the central white fringe are: —
Colored
15.
To observe diffraction, the size of the obstacle or aperture should be: —
Comparable to the wavelength of light
16.
If the phase difference between two light waves is π, then the interference is: —
Destructive
17.
The intensity at a point in a Young's double-slit experiment where the path difference is Δx is proportional to: —
cos²(πΔx/λ)
18.
In a diffraction pattern, the intensity of secondary maxima: —
Decreases rapidly with increasing order
19.
The difference between interference and diffraction is that diffraction involves superposition of waves originating from: —
Different parts of the same wavefront
20.
The fringe spacing in Young's double-slit experiment is directly proportional to: —
Distance of screen from slits
21.
In Young's double-slit experiment, if the distance between the slits is halved, the fringe width will be: —
Doubled
22.
In Young's double-slit experiment, if the distance of the screen from the slits is doubled, the fringe width will be: —
Doubled
23.
If the refractive index of the medium in Young's double-slit experiment is 'μ', the fringe width will: —
Decrease
24.
If the slit width in a single-slit diffraction experiment is decreased, the width of the central maximum: —
Increases
25.
In Young's double-slit experiment, if the wavelength of light is increased, the fringe width: —
Increases
26.
If the slit separation 'd' in Young's double-slit experiment is very small compared to the distance 'D' to the screen, then: —
Interference fringes are clearly visible
27.
Diffraction is more pronounced when the size of the obstacle is: —
Comparable to the wavelength of light
28.
The condition for the nth bright fringe in Young's double-slit experiment is a path difference of: —
nλ
29.
The condition for the nth dark fringe in Young's double-slit experiment is a path difference of: —
(n+1/2)λ
30.
Huygens' principle is used to determine the position of a wavefront at a: —
Future instant
31.
Which phenomenon supports Huygens' wave theory of light? —
All of the above
32.
Coherent sources of light are sources that emit waves with: —
Same frequency and constant phase difference
33.
According to Huygens' principle, each point on a wavefront acts as a source of: —
Secondary spherical waves
34.
Huygens' principle states that every point on a wavefront is a source of: —
Secondary wavelets propagating with the speed of light
35.
The angular position of the first diffraction minimum for a single slit of width 'a' is given by: —
sin⁻¹(λ/a)
36.
The angular width of the central maximum in single-slit diffraction is inversely proportional to: —
Slit width
37.
The intensity of light in Young's double-slit experiment is proportional to: —
The square of the amplitude
38.
In diffraction from a single slit, the central maximum is twice as wide as the other secondary maxima. This statement is: —
True
39.
The phenomenon of interference is observed when light waves from: —
A single source split into two coherent sources overlap
40.
The difference between interference and diffraction is that interference involves superposition of waves from: —
Two or more coherent sources
41.
If white light is used in Young's double-slit experiment, the central fringe is: —
White
42.
In Young's double-slit experiment, the maximum intensity is observed when the path difference is: —
Zero
43.
In Young's double-slit experiment, the minimum intensity is observed when the path difference is: —
λ/2
44.
What is the condition for constructive interference in terms of path difference (Δx)? —
Δx = nλ
45.
What is the condition for destructive interference in terms of path difference (Δx)? —
Δx = (2n+1)λ/2
46.
The condition for constructive interference in terms of phase difference (Δφ) is: —
Δφ = 2nπ
47.
The condition for destructive interference in terms of phase difference (Δφ) is: —
Δφ = (2n+1)π
48.
In single-slit diffraction, the first minimum is observed when the path difference between the diffracted rays from the edges of the slit is: —
λ
49.
The fringe width (β) in Young's double-slit experiment is given by: —
λD/d