Total Internal Reflection @YeoYongKiat

Uploaded February 2016 | Updated September 2026, 3 weeks ago

Air and water do not scatter light sufficient for us to see light rays or beams. However, oil and smoke molecules are large enough to scatter light, and these two media allow us to view the trajectory of light beams to study refraction and reflection.

Whenever light strikes a boundary, partial reflection takes place. If the boundary allows for the transmission of light, then refraction will also take place if the two optical media have different refractive indices.

Of particular interest is total internal reflection, which occurs only when light passes from an optically denser medium to an optically less dense medium at an incidence angle greater than the critical angle.

$Total Internal Reflection Air and water do not scatter light sufficient for us to see light rays or beams. However, oil and smoke molecules are large enough to scatter light, and these two media allow us to view the trajectory of light beams to study refraction and reflection. Whenever light strikes a boundary, partial reflection takes place. If the boundary allows for the transmission of light, then refraction will also take place if the two optical media have different refractive indices. Of particular interest is total internal reflection, which occurs only when light passes from an optically denser medium to an optically less dense medium at an incidence angle greater than the critical angle.$

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