How does the Brewster’s angle for monochromatic light at the interface between air and 87% pure glycerine vary with temperature at 25.6°C, 47.4°C, 56.2°C and 92.6°C?SL
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A
Official IB Result
IB Grade: A
Criteria A: Focus and Method
5/6
0
3
6
Criteria StrandsPro
A.1Topic clarity and communication
Excellent
A.2Research question formulation and focus
Excellent
A.3Methodology appropriateness and completeness
Moderate
Criteria Feedback
- The student's topic is specific, physics-focused, and immediately understandable.
- The student's research question is tightly delimited and clearly linked to a measurable outcome.
- The student's procedure includes substantial detail and enough structure to be replicable.
- The method does not fully show how the temperature was kept stable and uniform during each scan.
- The measured angular range does not always bracket the minimum, which weakens the ability of the method to answer the question well.
- Some control explanations, especially around polarisation, need to be justified more carefully.
Criteria B: Knowledge and Understanding
4/6
0
3
6
Criteria StrandsPro
B.1Subject knowledge application
Good
B.2Use of terminology and concepts
Good
Criteria Feedback
- The student uses key physics terminology such as Brewster’s angle, p- and s-polarisation, refractive index, and uncertainty with mostly correct application.
- The student shows good conceptual understanding by connecting the theory to the specific optical system they studied.
- The student applies the underlying physics to calculated values rather than relying only on description.
- Some terminology around polarisation is oversimplified and should be defined more precisely.
- A few explanations are stated too absolutely and would benefit from more careful physical phrasing.
- The student's background could be anchored more firmly in the expected properties of the actual glycerine solution they tested.
Criteria C: Critical Thinking
10/12
0
6
12
Criteria StrandsPro
C.1Research analysis and evaluation
Moderate
C.2Discussion and argument development
Moderate
C.3Critical evaluation
Moderate
Criteria Feedback
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- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
Criteria D: Presentation
4/4
0
2
4
Criteria StrandsPro
D.1Structure and formatting
Excellent
D.2Layout and visual elements
Good
Criteria Feedback
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- Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.