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What is light circular polarization?

Important Questions on Wave Optics

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

Two beams, A and B of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam A has maximum intensity (and beam B has zero intensity), a rotation of polaroid through 30^o makes the two beams appear equally bright. If the initial intensities of the two beams are I_A and I_B respectively, then

\frac{I_{A}}{I_{B}}

equals :

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

A beam of light falls on a system of

4

polaroids, which are arranged in succession, such that the axis of each polaroids makes

30 °

with the axis of the preceding one. The fraction of the intensity of the incident light that passes through the system is

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

When an unpolarized light of intensity

I_{0}

is incident on a polarizing sheet, the intensity of light which does not get transmitted is

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

A camera filled with a polarizer is placed on a mountain, in a manner to record only the reflected image of the sun from the surface of a sea as shown in the figure. If the sun rises at $6.00 AM$ and sets at $6.00 PM$ during the summer, then at what time in the afternoon will the recorded image have the lowest intensity, assuming there are no clouds and intensity of the sun at the sea surface is constant throughout the day? (Refractive index of water $= 1.33$ )

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

Unpolarized light of intensity

I

passes through an ideal polariser

A

. Another identical polariser

B

is placed behind

A

. The intensity of light beyond B is found to be

\frac{I}{2}

. Now another identical polariser

C

is placed between

A

and

B

. The intensity beyond B is now found to be

\frac{I}{8}

. The angle between polariser

A

and

C

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

Why polaroids are used in sunglasses?

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

In a stạck of three polarising sheets, the first and the third are crossed while the middle one has its axis at

45 °

to the axes of the other two. The fraction of intensity of an incident unpolarised beam of light that is transmitted by the stack is

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

Three polaroid sheets

P_{1}, P_{2}

and

P_{3}

are kept parallel to each other such that the angle between pass axes of

P_{1}

and

P_{2}

45 °

and that between

P_{2}

and

P_{3}

45 °

. If unpolarised beam of light of intensity

128 W m^{- 2}

is incident on

P_{1}

. What is the intensity of light coming out of

P_{3}

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

A system of three polarizers

P_{1}, P_{2}, P_{3}

is set up such that the pass axis of

P_{3}

is crossed with respect to that of

P_{1}

. The pass axis of

P_{2}

is inclined at

60^{o}

to the pass axis of

P_{3} .

When a beam of unpolarized light of intensity

I_{o}

is incident on

P_{1},

the intensity of light transmitted by the three polarizers is

I

. The ratio

(I_{o} / I)

equals (nearly):

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

A polarizer - analyser set is adjusted such that the intensity of light coming out of the analyser is just

10 %

of the original intensity. Assuming that the polarizer - analyser set does not absorb any light, the angle by which the analyser needs to be rotated further, to reduce the output intensity to zero, is

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

A beam of unpolarised light of intensity

I_{0}

is passed through a polaroid

A

and then through another polaroid

B

which is oriented so that its principle plane makes an angle of

45^{o}

relative to that of

A

. The intensity of the emergent light is:

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

Two Polaroids

P_{1}

and

P_{2}

are placed with their axis perpendicular to each other. Unpolarised light with intensity

I_{0}

is incident on

P_{1}

. A third polaroid

P_{3}

is kept in between

P_{1}

and

P_{2}

such that its axis makes an angle

45^{o}

with that of

P_{1}

. The intensity of transmitted light through

P_{2}

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

Unpolarized light of intensity

I

is incident on a system of two polarizers,

A

followed by

B

. The intensity of emergent light is

\frac{I}{2}

. If a third the polarizer

C

is placed between

A

and

B

the intensity of emergent light is reduced to

\frac{I}{3}

. The angle between the polarizers

A

and

C

θ

, then

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refractive index μ), is

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

How do you make a circular polarization?

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

When an unpolarized light of intensity

I_{0}

is incident on a polarizing sheet, the intensity of the light which does not get transmitted is

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

A linearly polarise wave is always

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

How does circular polarization work?

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

When an unpolarized light of intensity

I_{0}

is incident on a polarizing sheet, the intensity of the light which gets absorbed is

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Physics>Optics>Wave Optics>Circular and Elliptically Polarized Light

An unpolarised beam of intensity I₀ is incident on a pair of nicol prisms making an angle of 60^o with each other. The intensity of light emerging from the pair is -

What is light circular polarization?

Important Questions on Wave Optics

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