The eyes of mammal X accommodate in the same way as human eyes.
A researcher measures the diameter of the ciliary muscle ring while mammal X looks at targets at two distances. The measurements are compared with typical values for healthy mammals of the same species.
| Distance of target from eye in m | Typical ciliary muscle ring diameter in mm | Ciliary muscle ring diameter in mammal X in mm | Appearance of target to mammal X |
|---|---|---|---|
| 0.25 | 9.0 | 9.0 | sharp |
| 5.00 | 10.5 | 9.0 | blurred |
Using the information in the table, explain why the target at 5.00 m appears blurred to mammal X and how the shape of the lens would need to change for the target to appear sharp.
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.