Which of the following are the correct conditions required for total internal reflection to take place?
(i) The light should be travelling from an optically rarer to an optically denser medium.
(ii) The light should be travelling from an optically denser to an optically rarer medium.
(iii) The angle of incidence should be less than the critical angle for a given pair of media.
(iv) The angle of incidence should be greater than the critical angle for a given pair of media.
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A.
Both (i) and (iii)
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B.
Both (ii) and (iii)
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C.
Both (ii) and (iv)
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D.
Both (i) and (iv)
Correct Answer:
C. Both (ii) and (iv)
Explanation:
Total internal reflection occurs when light travels from a more optically dense medium to a less optically dense one, provided the angle of incidence exceeds the specific critical angle for those media. In this scenario, statement (ii) correctly identifies the required direction of travel (dense to rare), and statement (iv) correctly identifies the necessary angular condition (incidence greater than critical angle). Consequently, option C, which includes both (ii) and (iv), is the accurate choice.
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