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Question 19N.2.HL.TZ0.a

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.2.HL.TZ0.a
Level HL Paper 2 Time zone TZ0
Command term Predict Question number a Adapted from N/A
a.
[Maximum mark: 2]
19N.2.HL.TZ0.a

The lens of an optical system is coated with a thin film of magnesium fluoride of thickness d. Monochromatic light of wavelength 656 nm in air is incident on the lens. The angle of incidence is θ. Two reflected rays, X and Y, are shown.

The following refractive indices are available.

Air                            = 1.00
Magnesium fluoride = 1.38
Lens                         = 1.58

Predict whether reflected ray X undergoes a phase change.

[2]

Markscheme

there is a phase change ✔
of π OR as it is reflected off a medium of higher refractive index ✔

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