# In a certain double slit experimental arrangement interference fringes of width 1.0 mm each are observed when light of wavelength 5000 Å is used. Keeping the set up unaltered, if the source is replaced by another source of wavelength 6000 Å, the fringe width will be  (1) 0.5 mm (2) 1.0 mm (3) 1.2 mm (4) 1.5 mm

Subtopic:  Young's Double Slit Experiment |
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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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