Exam-style question
Try this first
For Defects of vision and correction, which option best uses X-ray attenuation to answer this objective: Calculate lens power where appropriate.?.
- A.Use X-ray attenuation: different absorption in bone and soft tissue, so the answer is anchored to attenuation contrast.
- B.Use a clinical description only, without naming the measured physical signal.
- C.Assume all tissue produces the same detector response, so no useful contrast is formed.
- D.Ignore the limitation or safety factor and treat the method as risk-free.
Model answer
What a good answer should say
- The correct option is Use X-ray attenuation: different absorption in bone and soft tissue, so the answer is anchored to attenuation contrast.
Explanation
Why this works
It is correct because X-ray attenuation gives a specific physical mechanism and connects the detector or image evidence to the objective. The other options are incorrect because they either avoid the measured signal, remove contrast or detection detail, or ignore a limitation that AQA medical physics answers should consider.
Common mistake
No common mistake is linked to this question yet.