WHAT IS TIR ?
When a ray of passes from denser medium to rare medium , it is deviated away from normal .
If we increase the angle of incidence then the angle of incidence then the angle of refraction also
increases . Then at a particular angle of incidence(C)the angle of refraction is 90 degree. This angle C
is known as critical angle.
If the angle of incidence is greater than critical angle then ray of light is totally reflected back in the same medium . This phenomenon is called as TIR.
CONDITIONS FOR TIR
1. Ray must move from denser to rarer medium.
2. Angle of incidence must be greater than critical angle.
APPLICATIONS OF TIR
1. The brilliance of diamonds is due to TIR.
2. Totally reflecting prisms.
3. Mirage
4. Optical fibre
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