Grade 12 Physics Unit 4 Notes on Light. This document contains the best possible explanation of derivations of this unit. Topics include the properties of light, refractive index, dispersion/diffraction, constructive/destructive interference, and young's double slit experiment.
Basic Reflection Refraction
crestsandtroughs
normal
nwavefront w
Boundary
Li Lr n
n
Diamond total internalreflection Fiberoptics
Properties of Light
1 Inteference Fromthis we know light is a wave not a particle
Duality ofLight Lightcan be both a particle and wave
perpendicrofteenergiropogation
Particlesmoving wave transverse light
particles movingparallel to the energy propagation wave Longitudinal
Lighthas an inbuilt electric and magnetic fields1900 to the propagation of the waves not particles
The Electromagnetic spectrum 1 pm to m
a wavelength increasing 1 A lo on
Frequency decreasing
1 nm to m
t mm to om
1mm to 3m
fi
888
v
88888 888
velocityhastoremain
speedofallcolorsin
thespectrumisthe C 3xiosmis
same
nloxionkminr.io'kminr
no
, A wave is a moving disturbance that transportsenergy from one place to another but does not
necessarily transport matter
tray
wavefront
ya
wavefront
Ffyiles wants
second Hz
I Al true
timetakento iompleteonecycle s
f NI no ofcycles
totaltime for Ncyclesis
T
E
The frequency of a wave is the same as that of thesource it is not affected bychanges
in the speed or wavelength of the wave itI 1it
unison
the fastest lightcan
vacuumairas upperlimit
such 3xiosmis
Diamonds sparkle because
light spends more time in a diamond less speed than upper limit
they have a large
II.ggInisffmtaterialand
Light travels in straightlinesknown as rectilinear or straightline propagation
n n n me
Bending of light at an angle from one medium to another refraction
Reflection t refraction Partial refraction
air
I reflected
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