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Physics 2 > 12) Nature of Light and Photometry > Flashcards

12) Nature of Light and Photometry Flashcards

1
Q

Electromagnetic waves

A

An oscillating magnetic field induces an oscillating magnetic field

They are transverse waves as they are perpendicular in the direction of propagation

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2
Q

Speed of electromagnetic waves

A

Depends on electrical and magnetic properties of the medium

Maximal I’m free space

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3
Q

Electromagnetic spectrum

A 
Radio 1mm
Microwaves 760nm
Visible 380nm
Uv 10nm
Xrays 1pm
Gamma 1fm
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4
Q

The wave nature of light

A

Is that it’s transverse looks like waves

Wavelength is from 380-760

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5
Q

Quantum nature of light

A

Light energy is emitted, propagated and absorbed in quanta

E=hv

Energy
Planks
Frequency

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6
Q

Radiometry and photometry

A

Radiometer is the measurement of electromagnetic radiation

Photometry is the measurement of light perceived by the human eye

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7
Q

Photodetectors

A

Convert radiometric and photometric into electrical signals

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8
Q

Types of photodetectors

A

Non selective
Is straight line
Output depends on the radiant flux

Selective
Wriggle
Depends on radiant flux and wavelength

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9
Q

Spectral efficiency function for the eye

A

Graph that shows 2 n shapes
One peak at 510 other at 555
X is wavelength
Y is V

Photopic vision
At normal brightness the eye sensitivity is at 555

Scotopic vision
At dark the eye sensitivity is at 510

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10
Q

Photometric quantities

A

Main photometric quantities

Luminous flux
Luminous intensity
Illuminance
Luminance

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11
Q

Luminous flux

A

The radiant flux

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12
Q

Luminous intensity of a light source

A

I=dø/d omega

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13
Q

Illuminance E of a surface

A

E=dØ/ds

Luminous flux per unit area of surface

Measured in LUX

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14
Q

Lamberts law

A

Immuninance = intensity cos alpha /r2

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15
Q

Types of reflection

A

Specular mirror like on a glossy surface

Diffuse at a matte surface

Albedo the diffuse reflection coefficient

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16
Q

Law of reflection

A

The angle of reflection is equal to the angle of Incidence

17
Q

Shells law

A

Sin alpha/ sin B

18
Q

Refraction into optically less dense medium

A

The angle of refraction is larger than the angle of incidence

19
Q

Optical fibres

A

2 thing layers of transparent material. Inner layer is optically denser than the outer

20
Q

Endoscope

A

Is an instrument used to observe the organs inside the body

Physics 2 (7 decks)

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