Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
10 Cards in this Set
- Front
- Back
|
Refractive index |
Ratio of speed of light in a vacuum, to ratio of speed of light in a medium |
|
|
Refraction |
When a light ray changes speed and direction, when moving through media of different optical densities |
|
|
Light from low to high |
Towards the normal N1 < N2
θi > θr |
|
|
High to low |
Away from normal N1>N2 θi<θr |
|
|
Optical density |
The ease in which light passes through a transparent medium |
|
|
Critical Angle |
Angle of incidence that results in an angle of refraction of 90 from the normal |
|
|
Total Internal Reflection |
When all light is reflected back into the medium of a higher density, instead of travelling into the medium of lower density. |
|
|
Two conditions needed for TIR to occur |
1 - Must go from HIGH TO LOW density 2 - θi must exceed critical angle |
|
|
Degree of diffraction α 1/w |
The smaller the width of the opening (w), the greater the degree of diffraction. |
|
|
Degree of diffraction α λ |
The greater the wavelength (λ), the greater the degree of diffraction. |
