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When a polaroid is rotated,the intesntiy...

When a polaroid is rotated,the intesntiy of light varies and corresponding to a particular orientation,intensity reduces to zero.It shown that incident ligth is

A

copletely plane polarised

B

partially plane polarised

C

unpolarised

D

none of the above

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Two polaroids are set in corossed positions.A third polaroid is placed between the two making an angle theta with the pass axis of the first polaroid.Write the expession for the intensity of light trnasmitted from the second polaroid .In what orientations will the transmitted intenesity be minimum adn

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An unpolarised beam of light of intensity I_0 is incident on a combination of two polaroids.Find the net intesity of light of intensity transmitted by the combinatin,when the pass axis of the two polaroids are inclined to each other at an angle of 60^@ .

Light from an ordianry source(say a sodium lamp) is passed through a polaroid sheet P_1 .The transmitted light is then made to pass through a second polaroid sheet P_2 ,which can be rotated so that the angle (theta) betwen the two polaroid sheets varies from 0^@ to 90^@ .Show graphically the variation of he intensity of light transmitted by P_1 and P_2 as a function of the angle theta .Take the incident beam intensity as I_0 . Why does the light from a cleear blue portion of the sky,show a rise and fall on intesnity,when viewed through a polaroid ,which is rotated?

Three polaroids are placed insuch a manner that the third polaroid is crossed with the first.When a beam of unpolarised light of intenstiy 24 W m^(-2) falls on the first polaroid,the intensity of light reduces to 3W m^(-2) on emerging fromo the thrid polariod.Find the angle between the trnasmission axes of the second and third polaroid.

Two polaroids are aligned,so that the intentsity of light emerging out of them is maximum.Through what angle one of them should be rotated ,so that the intensity of light emerging out of them is reduced to half.

When an unpolarised light intensity I_0 is incident on a polarising sheet ,the intensity of the light which does not get transmitted is

A beam of plane polarised light falls normally on a polariser (cross-sectional area 3 xx 10^(-4) m^2 ),which rotates about the axis of the ray with an angular velcity of 31.4 rads^(-1) .Find the energy of light passing through the polariser per revolution and the intensity of emergent beam,if flux of energy of the incident ray is 10^-3)W .

Two polaroids A and B are kept in crossed poisiton.How should a third polariod C be placed between them so that the intensity of polarised ligth transmitted by polaroid B reduces to 1//8th of the intensity of unpolarised light incident on A?

If a polaroid is kept in the path of a uniformly unpolarised light ,the intensity of the transmitted light to the intensity of the light ,when the polaroid is not kept in its path,is

MODERN PUBLICATION-UNIT TEST -06-EXERCISE
  1. The aperture of the largest telescope in teh world is of the order of ...

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  2. Which of the following phenomenon shows the transverse nature of light...

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  3. The waves that cannot be polarised are:

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  4. When a polariod is rotated,the intenstiy of ligth is not found to vary...

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  5. What are plane of polarisation and plane of vibration?

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  6. In the propagation of ligth waves,the ngle between the direction of pr...

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  7. When the light is incident at the polarising angle ,which of the follo...

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  8. A ray of light is incident on a medium at polarising angle .What is th...

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  9. What is the polarising anle of a medium of refractive index sqrt3?

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  10. The expression relating polarising angle nad refrractive indes is

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  11. If the speed of light and the polarising angle for a given medium are ...

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  12. Suppose P is polarising angle for a transparent medium an the speed of...

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  13. A ray of light is incident on a medium at polarising angle .What is th...

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  14. Which of the following materials may be used to produce polaroids?

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  15. The property of rotating the plane of polarisation is known as

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  16. When a polaroid is rotated,the intesntiy of light varies and correspon...

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  17. When a polaroid is rotated,the intensity of light varies but never red...

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  18. The specific rotation of an optically active substance of lenth l cm a...

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  19. A decimetre length of solution with concentratin 500 kg m^(-3) rotate...

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  20. The specific rotation of a liquid of lenth 10 cm,concentration 2 g cm^...

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