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7. The critical angle of a substance is 23. Which of the following angles will result in total internal reflection? I 20 II 23 III

7. The critical angle of a substance is 23. Which of the following angles will result in total

internal reflection?

I 20 II 23 III 30 IV 40

a) I, II

b) II

c) II,III, IV

d) III, IV

e) All of these angle

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