A vision-testing machine records the path of light through the eyes of two people while they look at test patterns.
| Person | Test pattern | Result recorded by the machine |
|---|---|---|
| R | a distant pattern | the light rays cross before reaching the retina |
| S | a nearby pattern | the light rays would meet behind the retina |
State the eye defect affecting each person.
Explain which type of lens should be fitted for each person and how each lens corrects the focusing problem.
102 exam-style questions on Edexcel GCSE Biology 2.4 The eye, covering 2.4.1 Structure and function of the eye and 2.4.2 Eye defects and their correction. Each one has a worked solution and a mark scheme showing where the marks go.