The refractive index of a given transparent medium is 1.4. Which of the following is the minimum internal angle for total internal reflection to take place in the medium?

a

30o

b

36o

c

44o

d

46o

e

54o

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Correct Option
d

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C4Chegbe
2 years ago

I don't undertand.
Can anyone help please???😭😭

Please show workings

I thought it is 54

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