All solutions here are SUGGESTED. Casey will hold no liability for any errors. Comments are entirely personal opinions.

1.A
2.D
3.C
4.A
5.C
6.A
7.D
8.C
9.A
10.C
11.B
12.A
13.D
14.A
15.A
16.A
17.C
18.A/ C ;I am not sure of Q18 though. Cos in reality, there is a phase change of pi on reflection, in which case, the answer shd be C. But phase change is not in the syllabus, then the answer should be A. so I dun know what Cambridge wants..:-(
19.C
20.B
21.C
22.D
23.B
24.B
25.A
26.B
27.B
28.B
29.D
30.B
31.B
32.D
33.B
34.C
35.C
36.C
37.C
38.A
39.D
40.B

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Feel free to explain the answers, if you are confident. Many thanks.

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