Light Flashcards
Speed of light
3x10 8
What type of wave is light?
Transverse
Law of reflection is
I=r
What is refraction?
When the wave direction changes due to speed changes across a boundary
What happens if the light is entering a more dense medium
Bends TO normal
What happens if the light is entering a less dense medium ?
Bends AWAY from normal
Refractive index equation
n= sin(i)/sin(r)
What is snells law?
Sin(i) dp to sin(r)
What is total internal reflection?
When no light leaves the material due to the angle of incidence being bigger than the critical angle
What happens when I>C
Total internal reflection
Uses of TIR
Endoscopes, optical fibres (for communications and keyhole surgery)
What is the critical angle equation
C=sin-1(1/n)
What is the critical angle?
When the light refracts 90° when it’s equal to angle of incidence
What is a converging lens?
Brings rays together
Uses of converging lens
Magnifying glass and correcting long sightedness
Diverging lens
Spreads rays out
Use of diverging lens
Corrects short sightedness
What’s a virtual image?
Can’t be projected onto a screen
What is the spectrum of white light?
Red, orange, yellow, green, blue, indigo and violet
What’s red lights characteristic?
Low frequency and long wavelength
What’s violets characteristic?
High frequency and short wavelength
What colour bends most from normal through a triangular prism?
Violet
What is monochromatic light
A light made from waves with all the same frequency so of the SAME colour
What’s the symbol for a diverging lens?
<—>
What’s symbol of converging lens?
> —<
