Young's Double Hole Experiment
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Q. In Young's double slit experiment, the distance of the nth dark fringe from the centre is-
- n(λ D2D)
- n(2dλ D)
- (2n−1)(λ D2d)
- (2n−1)(4dλ D)
Q.
In a YDSE experiment if a slab whose refractive index can be varied is placed in front of one of the slits then the variation of resultant intensity at mid-point of screen with ′μ′ will be best represented by μ≥1. [Assume slits of equal width and there is no absorption by slab]
Q. Consider a usual set-up Young's double slit experiment with slits of equal intensity as shown in the figure. Take O as origin and the y-axis as indicated. If average intensity of light at all points between y1=−λD4d and y2=+λD4d equals n times the intensity of central maxima, then n equals (take average over phase difference)
- 12(1+2π)
- 2(1+2π)
- (1+2π)
- 12(1−2π)
Q. Two small angled transparent prisms (each of refracting angle A=1∘) are so placed that their bases coincide, so that common base is BC. This device is called Fresnel’s biprism and is used to obtain coherent sources of a point source S illuminated by monochromatic light of wavelength 6000 ∘A placed at a distance a=20 cm. Calculate the separation between coherent sources. If a screen is placed at a distance b=80\text{cm}\) from the device, what is the fringe width of fringes (in cm) obtained
(Refractive index of material of each prism = 1.5).
(Refractive index of material of each prism = 1.5).
Q. In the arrangement shown in figure, slits S1 and S4 are having a variable separation Z. Point O on the screen is at the common perpendicular bisector of S1S2 and S3S4.
When Z=λD2d′ the intensity measured at O is I0. The intensity at O when Z=2λDd is
When Z=λD2d′ the intensity measured at O is I0. The intensity at O when Z=2λDd is
- I0
- 2I0
- 3I0
- 4I0
Q. In the Young’s double slit experiment the resultant intensity at a point on the screen is 75% of the maximum intensity of the bright fringe. Then the phase difference between the two interfering rays at that point is
- π6
- π4
- π3
- π2
Q. Two slits separated by 0.200 mm are to be used in Young’s double – slit experiment. Immediately behind the slits in a lens of focal length 0.500 m used to form the interference pattern on a screen located in the focal plane of the lens. What is wavelength of a monochromatic light source used to illuminate the slits if adjacent maxima of the interference pattern are separated by 1.00 mm?
- 400 nm
- 500 nm
- 600 nm
- 700 nm
Q. The intensity of each of the two slits in Young's double slit experiment is I0. Calculate the minimum separation between the two points on the screen where intensities are 2I0 and I0. Given, the fringe width equal to β.
- β4
- β12
- β
- β3
Q. In a Young’s double slit experiment, the resultant intensity at a point on the screen with two sources with intensities 2I and 8I is 14I. calculate the phase difference between the two sources.
- 40∘
- 50∘
- 60∘
- 90∘
Q. A Lloyd’s mirror of length 5 cm is illuminated with monochromatic light of wavelength λ(=6000∘A) from a narrow 1 mm slit in its plane and 5 cm plane from its near edge. Find the fringe width on a screen 120 cm from the slit and width of interference pattern on the screen.
- 0.036 cm, 1.2 cm
- 0.045 cm, 0.96 cm
- 1.2 cm, 0.036 cm
- 3.6 cm, 0.12 cm