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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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