A) When a ray moves from denser to rarer and incident angle is greater than critical angle.
B) When a ray moves from rarer to denser and incident angle is less than critical angle.
C) When a ray moves from rarer to denser and incident angle is equal to critical angle.
D) None of the above
Correct Answer: A
Solution :
The essential conditions for total internal reflection are (i) Light should travel from denser medium to a rarer medium. (ii) Angle of incidence in denser medium should be greater than the critical angle for pair of media in contact.
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