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Angle of incidence in the denser medium when angle of refraction is 90º in the rarer medium	Critical Angle Total Internal Reflection Optical Fibre Snell's Law Refractive Index (μ)
The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant	Critical Angle Total Internal Reflection Optical Fibre Snell's Law Refractive Index (μ)
Sine of the angle of incidence ÷ Sine of the angle of refraction	Critical Angle Total Internal Reflection Optical Fibre Snell's Law Refractive Index (μ)
Thin transparent rod through which light can travel by total internal refraction	Critical Angle Total Internal Reflection Optical Fibre Snell's Law Refractive Index (μ)
When a light travelling from a denser to a rarer medium with an angle of incidence greater than the critical angle, it is reflected back into the denser medium	Critical Angle Total Internal Reflection Optical Fibre Snell's Law Refractive Index (μ)