# Two coherent light sources S1 and S2 (λ= 6000 Å) are 1mm apart from each other. The screen is placed at a distance of 25 cm from the sources. The width of the fringes on the screen should be  (1) 0.015 cm (2) 0.025 cm (3) 0.010 cm (4) 0.030 cm

Subtopic:  Young's Double Slit Experiment |
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The figure shows a double slit experiment P and Q are the slits. The path lengths PX and QX are nλ and (n + 2) λ respectively, where n is a whole number and λ is the wavelength. Taking the central fringe as zero, what is formed at X

(1) First bright

(2) First dark

(3) Second bright

(4) Second dark

Subtopic:  Young's Double Slit Experiment |
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The Young's experiment is performed with the lights of blue (λ = 4360 Å) and green colour (λ = 5460 Å), If the distance of the 4th fringe from the centre is x, then

(1) x (Blue) = x (Green)

(2) x (Blue) > x (Green)

(3) x (Blue) < x (Green)

(4) $\frac{x\left(Blue\right)}{x\left(Green\right)}=\frac{5460}{4360}$

Subtopic:  Young's Double Slit Experiment |
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In Young's double slit experiment, if L is the distance between the slits and the screen upon which interference pattern is observed, x is the average distance between the adjacent fringes and d being the slit separation. The wavelength of light is given by

(1) $\frac{xd}{L}$

(2) $\frac{xL}{d}$

(3) $\frac{Ld}{x}$

(4) $\frac{1}{Ldx}$

Subtopic:  Young's Double Slit Experiment |
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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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