Question

write the relation between critical angle and total internal reflection

Answer 1

Total internal reflection is the phenomenon which occurs when a propagated wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface.

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Answer 2

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Total Internal Reflection and the Critical Angle.

1. If a ray of light is leaving a denser medium, it will bend away from the normal.  
2. As the angle of incidence inside the material increases the angle of refraction increases to a point at which it leaves the material at 90˚.
3. When the angle of refraction is equal to 90°, the angle of incidence is called the critical angle,
4. At any angle of incidence greater than the critical angle, the light cannot pass through the surface - it is all reflected. Total because all of the energy is reflected.
5.