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Question 17N.1.HL.TZ0.29

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.1.HL.TZ0.29
Level HL Paper 1 Time zone TZ0
Command term Question number 29 Adapted from N/A
29.
[Maximum mark: 1]
17N.1.HL.TZ0.29

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 π rad?

A. J only

B. J and L only

C. J and K only

D. J, K and L

[1]

Markscheme

A

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