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
Monday 8 June 2026 Morning Time allowed: The total time for
both sections of this paper is
Materials
2 hours. You are advised to
For this paper you must have:
• 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
this book. Write the question number against your answer(s). 4
• Do all rough work in this book. Cross through any work you do not want 5
to be marked.
TOTAL
• 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.
*jun2674083BB01*
IB/M/Jun26/G4007/V8 7408/3BB
, 2
Do not write
outside the
Section B box
Answer all questions in this section.
0 1 A person’s eye has a maximum refractive power of +48 D.
A glass lens of power +48 D is used to model the person’s eye.
0 1 . 1 The distance between the glass lens and an object is 250 mm.
Show that the distance from the glass lens to the image is about 23 mm.
[1 mark]
The length of the person’s eyeball is 22 mm.
The person uses a correcting lens to focus on an object that is 250 mm from their eye.
0 1 . 2 State and explain the defect of vision for this eye.
[2 marks]
0 1 . 3 Deduce the minimum power of this correcting lens.
[3 marks]
minimum power = D
*02*
IB/M/Jun26/7408/3BB
, 3
Do not write
outside the
0 1 . 4 Figure 1 shows how the person can avoid using the correcting lens but still see box
things clearly.
The person views some text through a small hole made by their fingers.
Figure 1
The eye focuses the light from the text onto the fovea.
Suggest why the method shown in Figure 1 works best when the text is brightly lit.
[2 marks]
8
Turn over for the next question
Turn over ►
*03*
IB/M/Jun26/7408/3BB
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
Monday 8 June 2026 Morning Time allowed: The total time for
both sections of this paper is
Materials
2 hours. You are advised to
For this paper you must have:
• 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
this book. Write the question number against your answer(s). 4
• Do all rough work in this book. Cross through any work you do not want 5
to be marked.
TOTAL
• 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.
*jun2674083BB01*
IB/M/Jun26/G4007/V8 7408/3BB
, 2
Do not write
outside the
Section B box
Answer all questions in this section.
0 1 A person’s eye has a maximum refractive power of +48 D.
A glass lens of power +48 D is used to model the person’s eye.
0 1 . 1 The distance between the glass lens and an object is 250 mm.
Show that the distance from the glass lens to the image is about 23 mm.
[1 mark]
The length of the person’s eyeball is 22 mm.
The person uses a correcting lens to focus on an object that is 250 mm from their eye.
0 1 . 2 State and explain the defect of vision for this eye.
[2 marks]
0 1 . 3 Deduce the minimum power of this correcting lens.
[3 marks]
minimum power = D
*02*
IB/M/Jun26/7408/3BB
, 3
Do not write
outside the
0 1 . 4 Figure 1 shows how the person can avoid using the correcting lens but still see box
things clearly.
The person views some text through a small hole made by their fingers.
Figure 1
The eye focuses the light from the text onto the fovea.
Suggest why the method shown in Figure 1 works best when the text is brightly lit.
[2 marks]
8
Turn over for the next question
Turn over ►
*03*
IB/M/Jun26/7408/3BB
