Question

5) For total internal reflection, critical angle is.....
a) 90 degree
b) greater than 90.
c) less than 90.
d) none of these​

Answer 1

Answer:

less than 90

Explanation:

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Answer 2

Answer:

for total internal reflection , critical angle has to be equal to 90°

Explanation:

if critical angle is less than 90 than the light ray will refract and if the critical angle is more than 90 then the light ray will reflect so it has to be equal to 90