Reflection
(1.3)
Reflection
Reflection
Reflection
Index of Refraction
In fact, light travels at its maximum speed in vacuum. It is convenient to define the index of refraction n of a medium to be the ratio 
(1.4)
As light travels from one medium to another, its frequency does not change but its wavelength does.
Reflection
(1.5)
(1.6)
(1.7) (1.8)
Snell’s law of refraction
Huygens’s Principle
In Huygens’s construction,
all points on a given wave front are taken as point sources for the production of spherical 
secondary waves, called wavelets, which propagate outward through a medium with speeds characteristic of waves in that medium. After some time interval has passed, the new position of the wave front is the surface tangent to the wavelets. 
Huygens’s Principle
Huygens’s Principle
Huygens’s Principle Applied to Reflection and Refraction 
Dispersion and Prisms
dispersion
angle of deviation
visible spectrum
