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Slide 2

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Models of waves & their properties
·Christiaan Huygens'
wave model considered
each point on a
HUYGENS' CONSTRUCTION wavefront as the source
of a new "disturbance"
- and there fore a
secondary "wavelet."
·These wavelets then
create the next
wavefront
·This explains why a…read more

Slide 3

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Reflection
Angle of incidence = angle of reflection (law of
reflection)
Angle measured from incident/reflected wave/ray
to the normal "ray" (perpendicular to the
surface)…read more

Slide 4

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Refraction
Change of direction of a wave when its speed
changes
From one medium to another (or LAW:
SNELL'S when light
moves from deeper water to shallow)
(i)
Where n is the refractive index,
written 1U2 (or 2U1) ­ the
numbers refer to the direction in
which the wave is travelling.
(R
) 1U2 = 1 / 2U1
n can also be found by V1 / V2…read more

Slide 5

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Question
The refractive index for water is approximately
1.33. A ray of light (velocity 3 × 10^8 ms-1)
enters the water. How fast does it travel within
the water?
1U2=1.33= V1/V2
1.33=3×10^8/V2
V2=3×10^8/1.33
V2=2.26×10^8 ms-1 (3sf)…read more

Slide 6

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Total internal reflection
The CRITICAL ANGLE is the angle of incidence
of a ray when the angle of refraction is 90
degrees.
So if you shone a ray of light into a glass block,
the critical angle would be when the ray leaves
the block along one of the edges
If the angle of incidence is greater than the
critical angle, total internal reflection occurs
and the ray is reflected back (following the law
http://www.learnerstv.com/animation/animation.php?
of reflection)
ani=102&cat=physics…read more

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