| Date | November 2017 | Marks available | 1 | Reference code | 17N.1.HL.TZ0.29 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 29 | Adapted from | N/A |
Question
A transparent liquid forms a parallel-sided thin film in air. The diagram shows a ray I incident on the upper air–film boundary at normal incidence (the rays are shown at an angle to the normal for clarity).
Reflections from the top and bottom surfaces of the film result in three rays J, K and L. Which of the rays has undergone a phase change of \(\pi \) rad?
A. J only
B. J and L only
C. J and K only
D. J, K and L
Markscheme
A
Examiners report
[N/A]
Syllabus sections
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