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Optics BLOCK 4 > Polarization I > Flashcards

Polarization I Flashcards

1
Q

Wave with electric and magnetic fields perpendicular to each other. Transverse wave

A

Electromagnetic wave

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2
Q

Longitudinal wave

A

Slinky, parallel

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3
Q

Transverse wave

A

Perpendicular

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4
Q

Oscillation occurs in a x,y plane perpendicular to the z direction of propagation

A

Transverse

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5
Q

Polarization is a property of _______ waves that describes their oscillations in (x,y) plane

A

Transverse

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6
Q

A completely random of waves vibrating in all planes

A

Unpolarized light

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7
Q

For electromagnetic waves propagating perpendicular to the plane of the paper, the double headed arrows show the vibration plane of the electrical field component for three different states

A

Polarized light

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8
Q

What are the three different polarization states?

A

Vertical, horizontal, and diagonal

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9
Q

A dipole with a vertical axis produces _________ polarized light

A

Vertically

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10
Q

A mixing of polarized and unpolarized waves

A

Partially polarized light

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11
Q

What are hte 4 fundamental properties of light?

A
  • intensity (amplitude)
  • wavelength
  • polarization
  • coherence
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12
Q

________ describes the directional orientation of the lights electric field in both space and time

A

Polarization

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13
Q

The vibration of the electric field is confined to a single plane

A

Plane-polarized light

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14
Q

From the vantage point along the Z axis, the electric field appears to trace a line, so the light may also be said to be _________

A

Linearly polarized

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15
Q

The electric friend for _________ light has no consistent plane of oscillation

A

Unpolarized

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16
Q

From the vantage point along the z axis, the electric field for polarized light can look like:

A
  • linearly polarized (vertical)
  • elliptically polarized
  • circularly polarized
  • linear polarized (horizontal)
17
Q

What defines the polarization type of the light?

A

The trace of the electric field

18
Q

Polarization properties of light can be changed by:

A
  • selective absorption
  • reflection
  • scattering
  • birefringance
19
Q

The _________ selectively transmits all or most of the electric field parallel to its axis, which removing most of the field in the perpendicular direction. Thus the unpolarized light incident on the polarizer is converted into linearly polarized light

A

Linear polarizer

20
Q

What does a slit act like as far as polarization goes?

A

Linear polarization

21
Q

What happens if you place a 90 degree polarizer over an 180 degree polarizer

A

Cancel each other

22
Q

How to calculate how much light is transmitted when there are two polarizer present

A

Law of malus
Ix=Im[cos^2(theta)]
Measured in amplitude

23
Q

The first polarizer, transmits 100% of light if the polarization axis is aligned with transmission axis

A

Polarizer

24
Q

The second polarizer, analyses the plane polarization properties of the light incident on it.

A

Analyzer

25
Q

Direction of polarization can be resolved into what two components?

A

In the plane of this diagram and perpendicular to it

26
Q

If a beam of non polarized light is incident on the surface of a smooth, nonconductor such as glass or plastic, the fraction of reflected light will be what?

A

Will be at least partially polarized

27
Q

The reflected light is totally polarized (when reflected light is perpendicular to refracted light )

A

Brewster’s angle

28
Q

What is the equation for brewsters angle

A

Tan(thetab)=(n2/n1)

29
Q

Fresnel’s prediction

A

0.04 % reflectance

30
Q

The percentage of incident light reflected from a glass surface. For all angles of incidence except ) and 90, then what?

A

The reflected light is at least partially polarized

31
Q

What angle should the transmission axis of a polarized filter be placed in order to reduce these unwanted reflections?

A

For polarized sunglasses, the transmission axis should be within +/ degrees of vertical (an industry standard)

32
Q

What does the correct orientation of the polarized filter do?

A

Effectively removes the reflected sunlight and permits view of the underlying objects

33
Q

Reflection off water is always _______

A

Horizontal

34
Q

Glare from water surface readily passes through the polarized filter whose transmission axis is _______

A

Horizontal

35
Q

Glare from water surface blocked by polarized filter whose transmission axis is _____

A

Vertical

36
Q

Purpose of antireflective coating

A
  • destruction interference
  • reduce glare
  • cosmetic
  • add polarization too

Optics BLOCK 4 (15 decks)

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