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Refractive Index
- Refraction is the change of direction of light as it passes from
one transparent substance into another.
- Refraction takes place because waves change speed when they cross a
boundary. The change in speed of the waves causes a change in speed of
the waves causes a change in direction, unless the waves are travelling
along a normal.
- A light ray will refract when it crosses from air into glass. It is
refracted towards the normal.
- The refractive index of substance is a measure of how much the substance can refract a light ray.
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