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Question 21M.2.HL.TZ1.6a

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.2.HL.TZ1.6a
Level HL Paper 2 Time zone TZ1
Command term State Question number a Adapted from N/A
a.
[Maximum mark: 1]
21M.2.HL.TZ1.6a

A painting is protected behind a transparent glass sheet of refractive index nglass. A coating of thickness w is added to the glass sheet to reduce reflection. The refractive index of the coating ncoating is such that nglass > ncoating > 1.

The diagram illustrates rays normally incident on the coating. Incident angles on the diagram are drawn away from the normal for clarity.

(a)

State the phase change when a ray is reflected at B.

[1]

Markscheme

«change is» π/180° ✓

 

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