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Two narrow slits (horizontally placed) kept close to each other are used to obtain an interference pattern on an adjacent vertical wall. The pattern of fringes will be

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Important Questions on Wave Optics

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Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
In Young's double-slit experiment, the distance between slits and the screen is 1 m and monochromatic light of wavelength 600 nm is being used. A person standing near the slits is looking at the fringe pattern. When the separation between the slits is varied, the interference pattern disappears for a particular distance d0 between the slits. If the angular resolution of the eye is 160°, then the value of d0 is close to
EASY
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
Young's double slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of the medium is nearly
MEDIUM
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
In Young’s double-slit experiment, the distance between the two identical slits is 6.1 times larger than the slit width. Then the number of intensity maxima observed within the central maximum of the single-slit diffraction pattern is :
HARD
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
Consider a Young's double slit experiment as shown in figure. What should be the slit separation d in terms of wavelength λ such that the first minima occurs directly in front of the slit (S1) ?

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HARD
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
Electrons accelerated from rest by an electrostatic potential are collimated and sent through a Young's double slit experiment. The fringe width is ω. If the accelerating potential is doubled, then the width is now close to:
EASY
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
In a double slit experiment, when light of wavelength 400 nm was used, the angular width of the first minima formed on a screen placed 1 m away was found to be 0.2°. What will be the angular width of the first minima, if the entire experimental apparatus is immersed in water? μwater=43
MEDIUM
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment

Using monochromatic light of wavelength λ , an experimentalist sets up the Young's double slit experiment in three ways as shown.
If she observes that y⁡ = β ′ , the wavelength of light used is :

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HARD
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
In a Young’s double slit experiment, the separation between the slits is 0.15 mm . In the experiment, a source of light of wavelength 589 nm is used and the interference pattern is observed on a screen kept 1.5 m away. The separation between the successive bright fringes on the screen is:
HARD
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
In a Young's double slit experiment, slits are separated by 0.5 mm, and the screen is placed 150 cm away. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide is:
MEDIUM
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
In Young's double-slit experiment, in an interference pattern, the second minimum is observed exactly in front of one slit. The distance between the slits is d and the distance between source and screen is D. The wavelength of the light source used is
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Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
In a Young's double slit experiment 15 fringes are observed on a small portion of the screen when light of wavelength 500 nm is used. Ten fringes are observed on the same section of the screen when another light source of wavelength λ is used. Find the value of λ (in nm ) .
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Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
In a double-slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double-slit within the central maxima of a single-slit pattern?
HARD
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
In a Young's double slit experiment, the slit separation d is 0.3 mm and the screen distance D is 1 m. A parallel beam of light of wavelength 600 nm is incident on the slits at angle α as shown in figure. On the screen, the point O is equidistant from the slits and distance PO is 11.0 mm. Which of the following statement(s) is/are correct?

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HARD
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
A light source, which emits two wavelengths λ1=400 nm and λ2=600 nm , is used in a Young's double slit experiment. If recorded fringe widths for λ1 and λ2 are β1 and β2 and the number of fringes for them within a distance y on one side of the central maximum are m1 and m2 , respectively, then
MEDIUM
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
In a double – slit experiment, at a certain point on the screen the path difference between the two interfering waves is 18th of a wavelength. The ratio of the intensity of light at that point to that at the center of a bright fringe is:
EASY
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
Angular width of the first minimum on either side of the central maximum due to a single slit of width a, illuminated by a light of wave length λ is
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Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
In Young's double slit experiment using monochromatic light of wavelength λ, the intensity of light at a point on the screen where path different is λ is K units. The intensity of light at a point where path difference is λ3 is
HARD
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
In the Young's double slit experiment using a monochromatic light of wavelength λ , the path difference ( in terms of an integer n ) corresponding to any point having half the peak intensity is
MEDIUM
Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
The distance between two coherent sources is 1 mm. The screen is placed at a distance of 1 m from the sources. If the distance of the third bright fringe is 1.2 mm from the central fringe, the wavelength of light used is
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Physics>Optics>Wave Optics>Interference of Light Waves and Young's Experiment
While conducting the Young's double slit experiment, a student replaced the two slits with a large opaque plate in the x-y plane containing two small holes that act as two coherent point sources S1, S2 emitting light of wavelength 600 nm. The student mistakenly placed the screen parallel to the x-z plane (for z>0) at a distance D=3 m from the mid-point of S1, S2 , as shown schematically in the figure. The distance between the sources d=0.6003 mm. The origin O is at the intersection of the screen and the line joining S1, S2 . Which of the following is (are) true of the intensity pattern on the screen?
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