During a stage rehearsal, a camera records a performer's pupil diameter after the eye has adjusted to each lighting level.
| Stage light intensity / arbitrary units | Pupil diameter / mm |
|---|---|
| 800 | 3.1 |
| 40 | 6.4 |
Which statement explains the change in pupil diameter when the stage lighting is reduced?
Accommodation widens the pupil to let more light reach the retina.
A reflex action widens the pupil to protect the retina from damage.
A reflex action widens the pupil to let more light reach the retina.
Accommodation widens the pupil to protect the retina from damage.
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.