DP Physics (first assessment 2025)

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Question 19M.1A.SL.TZ1.13

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1A.SL.TZ1.13
Level SL Paper 1A Time zone TZ1
Command term Question number 13 Adapted from N/A
13.
[Maximum mark: 1]
19M.1A.SL.TZ1.13

A glass block of refractive index 1.5 is immersed in a tank filled with a liquid of higher refractive index. Light is incident on the base of the glass block. Which is the correct diagram for rays incident on the glass block at an angle greater than the critical angle?

[1]

Markscheme

D

Examiners report

Response D was the most common response, with response A providing a significant distractor for roughly a third of candidates unsure about refraction beyond the critical angle.

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