DP Physics (last assessment 2024)

Question 22M.1.SL.TZ1.17

Date	May 2022	Marks available	[Maximum mark: 1]	Reference code	22M.1.SL.TZ1.17
Level	SL	Paper	1	Time zone	TZ1
Command term		Question number	17	Adapted from	N/A

17.

[Maximum mark: 1]

22M.1.SL.TZ1.17

A ray of light is incident on the flat side of a semi-circular glass block placed in paraffin. The ray is totally internally reflected inside the glass block as shown.

The refractive index of glass is $n_{1}$ and the refractive index of paraffin is $n_{2}$ .

What is correct?

A. $\sin θ = \frac{n_{1}}{n_{2}}$

B. $\sin θ = \frac{n_{2}}{n_{1}}$

C. $\sin θ = \frac{1}{n_{1}}$

D. $\sin θ = \frac{1}{n_{2}}$

[1]

Markscheme

Examiners report

While option A (correct) was the most frequent response from candidates, options B and D were significant distractors. Very few candidates selected option A, recognizing that different frequency and amplitude could not lead to zero intensity through interference.

Syllabus sections

Core

Core » Topic 4: Waves » 4.4 – Wave behaviour

Core » Topic 4: Waves

Question 22M.1.SL.TZ1.17

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