A beam of light AO is incident on a glass slab (μ = 1.54) in a direction as shown in figure. The reflected ray OB is passed through a Nicol prism on viewing through a Nicole prism, we find on rotating the prism that, 

      

1. the intensity is reduced down to zero and remains zero.
2. the intensity reduces down some what and rises again.
3. there is no change in intensity.
4. the intensity gradually reduces to zero and then again increases.

Subtopic:  Polarization of Light |
 57%
From NCERT
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In the propagation of electromagnetic waves, the angle between the direction of propagation and plane of polarisation is:

(1) 0o

(2) 45o

(3) 90o

(4) 180o

Subtopic:  Polarization of Light |
From NCERT
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An unpolarised light incident on a polariser has amplitude A, and the angle between analyzer and polariser is \(60^{\circ}\). The light transmitted by the analyzer has an amplitude of:

1. A2

2. A/22

3. 3A/2

4. A/2

Subtopic:  Polarization of Light |
From NCERT
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Light passes successively through two polarimeters tubes each of length 0.29m. The first tube contains dextro rotatory solution of concentration 60kgm–3 and specific rotation 0.01rad m2kg–1. The second tube contains laevo rotatory solution of concentration 30kg/m3 and specific rotation 0.02 radm2kg–1. The net rotation produced is 

(1) 15°

(2) 0°

(3) 20°

(4) 10°

Subtopic:  Polarization of Light |
 70%
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Unpolarized light of intensity 32Wm–2 passes through three polarizers such that transmission axes of the first and second polarizer makes and angle 30° with each other and the transmission axis of the last polarizer is crossed with that of the first. The intensity of final emerging light will be

(1) 32 Wm–2

(2) 3 Wm–2

(3) 8 Wm–2

(4) 4 Wm–2

Subtopic:  Polarization of Light |
 64%
From NCERT
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In the visible region of the spectrum the rotation of the place of polarization is given by θ=a+bλ2. The optical rotation produced by a particular material is found to be 30° per mm at λ=5000Å and 50° per mm at λ=4000Å. The value of constant a will be

(1) +50°9per mm

(2) 50°9per mm

(3) +9°50per mm

(4) 9°50per mm

Subtopic:  Polarization of Light |
 63%
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When an unpolarized light of intensity I0 is incident on a polarizing sheet, the intensity of the light which does not get transmitted is 

(1) Zero

(2) I0

(3) 12I0

(3) 14I0

Subtopic:  Polarization of Light |
 74%
From NCERT
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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 |
 53%
From NCERT
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In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. What would be the condition on θ for constructive interference at P between the ray BP and reflected ray OP?

(1) cosθ = 3λ/2d

(2) cosθ = λ/4dθ

(3) secθ – cosθ = λ/d

(4) secθ – cosθ = 4λ/d

Subtopic:  Interference vs Diffraction |
 51%
From NCERT
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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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