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Total internal reflection of a ray of light is possible when the ($i_c=$ critical angle, $i=$ angle of incidence)
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Ray goes from denser medium to rarer medium and $i\gt i_c$
Total internal reflection is a phenomenon when the incident ray experiences complete reflection on a refracting surface. The three conditions in refraction when critical angle is given are,
1. When $i \lt i$, then the incident refracts and the angle it makes with the normal is called the angle of refraction.
2. When $i=i_e$ then the incident ray refracting and coincides with the refracting. The angle of refraction is $90^{\circ}$ in this case.
3. When $i \gt i_0$, then the incident ray is totally reflected back and this incident is termed as total internal reflection.
1. When $i \lt i$, then the incident refracts and the angle it makes with the normal is called the angle of refraction.
2. When $i=i_e$ then the incident ray refracting and coincides with the refracting. The angle of refraction is $90^{\circ}$ in this case.
3. When $i \gt i_0$, then the incident ray is totally reflected back and this incident is termed as total internal reflection.
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