Today in the beginning of class we basically just reviewed the notes we were supposed to copy off the board in the last 2 days...(Particle and Wave Theory of Light) But Mrs. K wrote it in a "simpler" way on the smart board...Here they are:


PARTICLE THEORY OF LIGHT
Scientist composed: NEWTON
Property easily explained by Particle Theory: Rectilinear Propagation (Travels in straight lines)
Reflection: angle of incidence = angle of reflection
Refraction: Light travels faster in water than air. (INCORRECT!!!)
Diagram of refraction:(below)

Dispersion: All colours of light have the same frequency. Wavelength x Velocity factors are different in each colour. --Wavelength of red is Largest
--Wavelength of violet is Smallest
Partial Reflection/Refraction: "Theory of Fits" Newton thought this was a weak explanation. Diagram-->

Diffraction: Particles interfered with the edges of a barrier (VERY weak explanation)



WAVE THEORY OF LIGHT
Scientist composed: HUGGENS
Property easily explained by wave theory of light: Each point is a new source for a wavelet to be created.(connect the wavelets & get a new wavefront)
Diagram---->>>>
Reflection: Angle of incidence = Angle of reflection
Refraction: Light slows down when entering water. (FOUCAULT showed that this happened)


Dispersion: (diagram below) (INCORRECT!!!)






Partial Reflection/Refraction: The Wave Theory is better able to explain this phenomenon than the Particle Theory.
Diffraction: Wavelength of light is very small. (GRIMALDI showed evidence for this)


Finally, near the middle of class we watched a video on youtube titled "YOUNG'S EXPERIMENT" and recieved MORE homework.
Finish questions 1-15. OMIT #2
and for extra practice...
Young's experiment problems.

I'M TIRED NOW...BYE GUYS!