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Question

# For total internal reflection the ray of light enters from denser to rarer mediumfrom rarer to denser mediummedium of same refractive indexmedium with same coefficient of reflection

A
from denser to rarer medium
B
from rarer to denser medium
C
medium with same coefficient of reflection
D
medium of same refractive index
Solution
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#### Total internal reflection takes place when a light enters from denser to rarer medium. From snell's law, the light tends to bend away from the normal to the surface. If the difference in optical densities is huge, the light rays tends to refract at more than 90∘ and actually starts reflecting.

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Total internal reflection can happen only when light ray passes from denser to rarer medium.
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Which of the following are the essential conditions for Total Internal Reflection to take place?
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