AQA A-LEVEL PHYSICS Paper 3 Section B Medical physics (7408/3BB)
Combined Question Paper and Mark Scheme
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
PHYSICS
Paper 3
Section B Medical physics
Tuesday 17 June 2025 Morning Time allowed: The total time for
both sections of this paper is
Materials
For this paper you must have:
2 hours. You are advised to
• a pencil and a ruler spend approximately
• a scientific calculator 50 minutes on this section.
• a Data and Formulae Booklet
• a protractor.
Instructions For Examiner’s Use
• Use black ink or black ball-point pen.
Question Mark
• Fill in the boxes at the top of this page.
• Answer all questions. 1
• You must answer the questions in the spaces provided. Do not write 2
outside the box around each page or on blank pages. 3
• If you need extra space for your answer(s), use the lined pages at the end of
4
this book. Write the question number against your answer(s). IB/M/Jun25/G4006/E6
• Do all rough work in this book. Cross through any work you do not want TOTAL
to be marked.
• Show all your working.
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 35.
• You are expected to use a scientific calculator where appropriate.
• A Data and Formulae Booklet is provided as a loose insert.
, 3
Do not write
outside the
Section B box
Answer all questions in this section.
0 1 . 1 Figure 1 shows a simplified diagram of an eye that has no sight defects.
The eye is viewing a distant point object.
Complete, on Figure 1, the paths of the two rays to the back of the eye.
[2 marks]
Figure 1
0 1 . 2 Accommodation is the ability of the eye to change its optical power.
Which part of the eye enables accommodation?
Tick (✓) one box.
[1 mark]
cornea
iris
lens
Question 1 continues on the next page
Turn over ►
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IB/M/Jun25/7408/3BB
, 4
Do not write
outside the
The accommodation amplitude A, in dioptres, is given by box
1 1
A= −
d1 d2
where
d1 is the distance, in m, from the eye to its near point
d2 is the distance, in m, from the eye to its far point.
Figure 2 shows how the value of A varies with age for a typical person.
Figure 2
for more: tyrionpapers.com
IB/M/Jun25/7408/3BB
Combined Question Paper and Mark Scheme
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
PHYSICS
Paper 3
Section B Medical physics
Tuesday 17 June 2025 Morning Time allowed: The total time for
both sections of this paper is
Materials
For this paper you must have:
2 hours. You are advised to
• a pencil and a ruler spend approximately
• a scientific calculator 50 minutes on this section.
• a Data and Formulae Booklet
• a protractor.
Instructions For Examiner’s Use
• Use black ink or black ball-point pen.
Question Mark
• Fill in the boxes at the top of this page.
• Answer all questions. 1
• You must answer the questions in the spaces provided. Do not write 2
outside the box around each page or on blank pages. 3
• If you need extra space for your answer(s), use the lined pages at the end of
4
this book. Write the question number against your answer(s). IB/M/Jun25/G4006/E6
• Do all rough work in this book. Cross through any work you do not want TOTAL
to be marked.
• Show all your working.
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 35.
• You are expected to use a scientific calculator where appropriate.
• A Data and Formulae Booklet is provided as a loose insert.
, 3
Do not write
outside the
Section B box
Answer all questions in this section.
0 1 . 1 Figure 1 shows a simplified diagram of an eye that has no sight defects.
The eye is viewing a distant point object.
Complete, on Figure 1, the paths of the two rays to the back of the eye.
[2 marks]
Figure 1
0 1 . 2 Accommodation is the ability of the eye to change its optical power.
Which part of the eye enables accommodation?
Tick (✓) one box.
[1 mark]
cornea
iris
lens
Question 1 continues on the next page
Turn over ►
for more: tyrionpapers.com
IB/M/Jun25/7408/3BB
, 4
Do not write
outside the
The accommodation amplitude A, in dioptres, is given by box
1 1
A= −
d1 d2
where
d1 is the distance, in m, from the eye to its near point
d2 is the distance, in m, from the eye to its far point.
Figure 2 shows how the value of A varies with age for a typical person.
Figure 2
for more: tyrionpapers.com
IB/M/Jun25/7408/3BB
