Question

vii) The core of optical fibre is made up of plastic of refractive index 1.5.
For which angles with the surface of cross section will light undergo total
internal reflection?
A) angles less than 48° 11
B) angles more than 48° 11'
C) angles less than 41° 49°
D) angles more than 49° 49'​

Answer 1

Answer:

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Answer 2

Answer:

B) angles more than 48°11'