Exam-style question
Try this first
For Physics of vision, which option best uses detector sensitivity to answer this objective: Link optical power to focal length.?.
- A.Use detector sensitivity: turning incident radiation into a measurable electrical signal, so the answer is anchored to detection efficiency.
- 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 detector sensitivity: turning incident radiation into a measurable electrical signal, so the answer is anchored to detection efficiency.
Explanation
Why this works
It is correct because detector sensitivity 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.