1.
The fringe width in Young’s double-slit experiment increases when
2.
Fringe visibility V = ? (Imax = max intensity, Imin = min intensity)
3.
In YDSE, 7th maximum for λ1 at distance d1 and for λ2 at d2. Ratio d1/d2 = ?
4.
If one slit is covered with transparent film (yellow) & the other with blue filter
5.
If one slit transmits 1/2 intensity of other
6.
Two equally bright slits but phase difference π/3. Intensity at centre?
7.
Using two close wavelengths:
8.
White light in YDSE, central fringe is
9.
Thin oil film (t = 10000 Å) appears bright for which wavelengths? (n=1.4)
10.
Source emits EM wave λ = 3 m. One beam travels +1.5 m. Intensity reduces to 1/4. Resultant intensity
11.
Plate thickness t giving path change = λ/2
12.
In YDSE, S above B (slits). Introducing high refractive index material in one path causes fringes to shift
13.
Two rays λ travel in media μ1 & μ2 with different lengths. Phase difference
14.
Angular fringe width with sodium light (air) 0.20°. When immersed in water
15.
Replacing sodium yellow with blue light
16.
If mica sheet of t, μ placed in one path, path difference = ?
17.
Inserting thin glass in front of slit A shifts pattern
18.
If red filter in S1 and blue filter in S2
19.
YDSE slit separation = 0.9 mm, D = 1 m, 2nd dark at 1 mm → find λ
20.
Glass sheet absorbs half from one slit
21.
In YDSE, if slit width (aperture) is increased
22.
Fringe contrast depends on
23.
In YDSE, if slit separation is halved & screen distance doubled, fringe width becomes
24.
Fringe width 0.4 mm in air. In water μ = 4/3 → new fringe width
25.
Interference fringes in chamber with water (μ=4/3). If water removed →
26.
Interference observed with air; chamber evacuated →
27.
Interference possible with two sources if
28.
White fringe at center; screen moved by 0.05 m → white fringe
29.
Best contrast in YDSE requires intensities
30.
Wavefront is a surface in which
31.
Two light sources coherent when
32.
Newton proposed corpuscular theory based on
34.
Two waves coherent if they have
35.
Light from one source coherent if obtained by
36.
In interference, energy
37.
Necessary condition for interference
38.
Incoherent sources because detectors need time to sense intensity
39.
If two beams of I and 4I superpose → possible maxima & minima
40.
Two waves (intensity I₀) with 60° phase diff → resultant intensity
41.
Waves y₁=3 sinωt, y₂=3cosωt → correct
42.
Intensity of resultant of two equal waves with phase φ
43.
Waves y₁ = 4 sinωt, y₂ = 3 sin(ωt+π/3) → resultant amplitude
44.
Distinguishable characteristic of monochromatic light
45.
For constructive interference, phase diff =
