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Physics 2 > 15) Polarisation Of Light > Flashcards

15) Polarisation Of Light Flashcards

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1
Q

Polarisation plane of light

A

This is the plane defined by the light vector and light velocity vector
=polarisation plane

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2
Q

Natural light

A

The photons have various polarisation planes

All orientations of the plane is equal

DRAWING

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3
Q

Linearly polarised light

A

All photons are polarised in the same plane

DRAWING

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4
Q

Partially polarised light

A

The emitted photons have various polarisation planes

The orientation of the polarisation plane is not equal

DRAWING

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5
Q

Sensitivity of the eye to light polarisation

A

The human eye is insensitive to the polarisation of light

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6
Q

Polarisation by reflection and refraction

A

Reflected beam in a plane normal to the plane of incidence

Refracted in the place of incidence

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7
Q

Brewster angle

A

The reflected beam is linearly polarised

The refracted beam is partially polarised

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8
Q

Polarisation by birefringence

A

In some materials the incident beam is split into 2 beams

Ordinary and extraordinary

When the incident beam is unpolarised the intensities of the 2 beams are equal

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9
Q

Dichroic Crystals

A

Absorb the ordinary ray and only the extraordinary ray leaves the crystal

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10
Q

Polariser

A

Polariser is an optical element which transforms unpolarised light into linearly polarised light

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11
Q

Malus Law

A

Ø=Øocos^2 alpha

Øo is luminous flux
Alpha is angle

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12
Q

Analyser

A

A polariser used to determine the polarisation plane of light

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13
Q

Transmission of unpolarised light by a polariser and analyser pair

A

Angle between plane of polarisation and the polariser plane is alpha

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14
Q

Optical activity

A

Rotation of polarisation plane as it travels through certain materials

Eg
Amino acids sugars

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15
Q

Optically rotation substances

A

Levorotatory type L

Dextorotatory Type D

Racemic mixture L+D non rotating

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16
Q

Optical activity

A

Alpha =(alpha) cd

Concentration is c
Path length is D

17
Q

Polarimetry

A

Method for measuring the concentrations of optically rotating substances in solution

18
Q

Spectropolarimetry

A

Method for investigation of the structure of optically rotating samples via dispersion of their specific rotation

19
Q

Polarisation microscope

A

Method for observing and investigations optically rotating microscopic objects

Eg
Muscle tissue
Connective tissue
Nerve fibres

20
Q

Polarisation microscope

A

Polariser
Provides illumination by polarised light

Analyser
Mounted in the tube

Polarisation planes of the polariser and analyser are crossed

Physics 2 (7 decks)

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