When the angle of incidence on a material is 60°, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in ms–1)

1. 3 × 108

2. 32×108

3. 3×108

4. 0.5 × 108

Subtopic:  Polarization of Light |
 78%
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Two polaroids are placed in the path of unpolarized beam of intensity I0 such that no light is emitted from the second polaroid. If a third polaroid whose polarization axis makes an angle θ with the polarization axis of first polaroid, is placed between these polaroids then the intensity of light emerging from the last polaroid will be 

(1) I08sin22θ

(2) I04sin22θ

(3) I02cos4θ

(4) I0cos4θ

Subtopic:  Polarization of Light |
 55%
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In the Young's double slit experiment, if the phase difference between the two waves interfering at a point is ϕ, the intensity at that point can be expressed by the expression-
(where A and B depend upon the amplitudes of the two waves)
(1) I=A2+B2cos2ϕ
(2) I=ABcosϕ
(3) I=A+Bcosϕ2
(4) I=A+Bcosϕ

Subtopic:  Young's Double Slit Experiment |
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In the figure is shown Young’s double-slit experiment, Q is the position of the first bright fringe on the right side of O. P is the 11th bright fringe on the other side, as measured from Q. If the wavelength of the light used is 6000 × 10–10 m, then S1B will be equal to 

(1) 6 × 10–6 m

(2) 6. 6 × 10–6 m

(3) 3.138 × 10–7 m

(4) 3.144 × 10–7 m

Subtopic:  Young's Double Slit Experiment |
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In Young’s double slit experiment, the two slits act as coherent sources of equal amplitude A and wavelength λ. In another experiment with the same set up the two slits are of equal amplitude A and wavelength λ but are incoherent. The ratio of the intensity of light at the mid-point of the screen in the first case to that in the second case is 

(1) 1 : 2

(2) 2 : 1

(3) 4 : 1

(4) 1 : 1

Subtopic:  Young's Double Slit Experiment |
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A monochromatic beam of light falls on YDSE apparatus at some angle (say θ) as shown in figure. A thin sheet of glass is inserted in front of the lower slit S2. The central bright fringe (path difference = 0) will be obtained

(1) At O

(2) Above O

(3) Below O

(4) Anywhere depending on angle θ, thickness of plate t and refractive index of glass μ

Subtopic:  Young's Double Slit Experiment |
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Two ideal slits S1 and S2 are at a distance d apart, and illuminated by light of wavelength λ passing through an ideal source slit S placed on the line through S2 as shown. The distance between the planes of slits and the source slit is D. A screen is held at a distance D from the plane of the slits. The minimum value of d for which there is darkness at O is

(1) 3λD2

(2) λD

(3) λD2

(4) 3λD

Subtopic:  Young's Double Slit Experiment |
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In a single slit diffraction of light of wavelength λ by a slit of width e, the size of the central maximum on a screen at a distance b is

(1) 2bλ+e

(2) 2bλe

(3) 2bλe+e

(4) 2bλee

Subtopic:  Diffraction |
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In a YDSE bi-chromatic light of wavelengths, 400 nm and 560 nm are used. The distance between the slits is 0.1 mm and the distance between the plane of the slits and the screen is 1m. The minimum distance between two successive regions of complete darkness is 

(1) 4 mm

(2) 5.6 mm

(3) 14 mm

(4) 28 mm

Subtopic:  Young's Double Slit Experiment |
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In Young's double-slit experiment, the intensity at a point is (1/4) of the maximum intensity. Angular position of this point is :

(1) sin-1(λ/d)

(2) sin-1(λ/2d)

(3) sin-1(λ/3d)

(4) sin-1(λ/4d)

Subtopic:  Young's Double Slit Experiment |
 51%
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