G9 Wave Model - Bending Light
Gapfill exercise
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along bounce boundary critical dispersion normal reflected spectrum speeds
Light is refracted when it passes from one mdeium to another. This is because the light changes speed.
Total Internal Reflection
If light travels from a 'slower' medium into a 'faster' medium it gets bent away from the
along
bounce
boundary
critical
dispersion
normal
reflected
spectrum
speeds
, which means towards the
along
bounce
boundary
critical
dispersion
normal
reflected
spectrum
speeds
between the two media.
If you keep increasing the angle at which it hits the boundary, it will reach a point where the ray passing out of the first medium travels
along
bounce
boundary
critical
dispersion
normal
reflected
spectrum
speeds
the boundary. This is known as the
along
bounce
boundary
critical
dispersion
normal
reflected
spectrum
speeds
angle. If you keep on increasing the angle at which the ray hits the boundary, the ray will be
along
bounce
boundary
critical
dispersion
normal
reflected
spectrum
speeds
back from it. This is called
total internal reflection
(TIR).
Optical fibres use total internal reflection. The light ray hits the inside boundary of the fibre at an angle greater than the critical angle and gets reflected back. It continues to
along
bounce
boundary
critical
dispersion
normal
reflected
spectrum
speeds
all the way along the inside of the fibre.
Dispersion
Different wavelengths of light travel at different
along
bounce
boundary
critical
dispersion
normal
reflected
spectrum
speeds
through glass. This is used in
along
bounce
boundary
critical
dispersion
normal
reflected
spectrum
speeds
where a glass prism is used to produce a
along
bounce
boundary
critical
dispersion
normal
reflected
spectrum
speeds
of colours.
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