A landscape photographer can focus clearly on the controls of a camera held nearby, but distant mountains appear blurred. An eye test gives the following results. In each test, light comes from a distant object and any corrective lens is placed in front of the eye.
| Correction used | Position of the focus relative to the retina |
|---|---|
| No lens | In front of the retina |
| Lens A | On the retina |
Explain what the results show about the person's eye and about lens A.
A laser procedure is available to reshape the cornea.
Predict how the cornea should be reshaped to correct the defect. Explain your answer.
135 exam-style questions on OCR GCSE Biology 3.1 Coordination and control – the nervous system, covering 3.1.1 Structure of the nervous system, 3.1.2 Coordinated response, 3.1.3 The reflex arc, 3.1.4 Structure of the eye, 3.1.5 Defects of the eye, 3.1.6 Structure and function of the brain, 3.1.7 Difficulties of investigating brain function, and 3.1.8 Limitations in treating nervous system damage. Each one has a worked solution and a mark scheme showing where the marks go.