# In Young's experiment, light of wavelength $$4000~\mathring{A}$$ is used to produce bright fringes of width $$0.6$$ mm, at a distance of $$2$$ meters. If the whole apparatus is dipped in a liquid of refractive index $$1.5$$, then fringe width will be: 1. $$0.2~\text{mm}$$ 2. $$0.3~\text{mm}$$ 3. $$0.4~\text{mm}$$ 4. $$1.2~\text{mm}$$

Subtopic:  Young's Double Slit Experiment |
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In Young's double-slit experiment, the phase difference between the light waves reaching the third bright fringe from the central fringe will be (λ =6000 Å )

(1) Zero

(2) 2$\pi$

(3) 4$\pi$

(4) 6$\pi$

Subtopic:  Young's Double Slit Experiment |
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In two separate set-ups of the Young's double slit experiment, fringes of equal width are observed when lights of wavelengths in the ratio $$1:2$$ are used. If the ratio of the slit separation in the two cases is $$2:1$$, the ratio of the distances between the plane of the slits and the screen in the two set-ups is:
1. $$4:1$$
2. $$1:1$$
3. $$1:4$$
4. $$2:1$$

Subtopic:  Young's Double Slit Experiment |
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In a biprism experiment, by using light of wavelength 5000 Å, 5 mm wide fringes are obtained on a screen 1.0 m away from the coherent sources. The separation between the two coherent sources is

(1) 1.0 mm

(2) 0.1 mm

(3) 0.05 mm

(4) 0.01 mm

Subtopic:  Diffraction |
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The slits in Young's double-slit experiment have equal widths and the source is placed symmetrically relative to the slits. The intensity at the central fringe is $$I_0$$. If one of the slits is closed, the intensity at this point will be:
1. $$I_0$$
2. $$\frac{I_0}{4}$$
3. $$\frac{I_0}{2}$$
4. $$4I_0$$

Subtopic:  Young's Double Slit Experiment |
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A thin mica sheet of thickness 2×10–6 m and refractive index (μ = 1.5) is introduced in the path of the first wave. The wavelength of the wave used is 5000 Å. The central bright maximum will shift

(1) 2 fringes upward

(2) 2 fringes downward

(3) 10 fringes upward

(4) None of these

Subtopic:  Young's Double Slit Experiment |
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In Young's double slit experiment, 62 fringes are seen in visible region for sodium light of wavelength 5893 Å. If violet light of wavelength 4358 Å is used in place of sodium light, then number of fringes seen will be

(1) 54

(2) 64

(3) 74

(4) 84

Subtopic:  Young's Double Slit Experiment |
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In Young's double slit experiment, the angular width of fringe is $$0.20^{\circ}$$ for sodium light of wavelength $$5890~\mathring{A}$$. The angular width of fringe, if the complete system is dipped in water, will be:
1. $$0.11^{\circ}$$
2. $$0.15^{\circ}$$
3. $$0.22^{\circ}$$
4. $$0.30^{\circ}$$

Subtopic:  Young's Double Slit Experiment |
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In Young's double slit experiment, the distance between the two slits is 0.1 mm and the wavelength of light used is 4×10–7 m. If the width of the fringe on the screen is 4 mm, the distance between screen and slit is

(1) 0.1 mm

(2) 1 cm

(3) 0.1 cm

(4) 1 m

Subtopic:  Young's Double Slit Experiment |
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In Young's double slit experiment using sodium light (λ = 5898 Å), 92 fringes are seen. If given colour (λ = 5461 Å) is used, how many fringes will be seen

(1) 62

(2) 67

(3) 85

(4) 99

Subtopic:  Young's Double Slit Experiment |
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