A stage performer has been waiting under dim lighting. The stage lights then become much brighter.
Which statement correctly describes the response of the performer's eye and explains its benefit?
The iris makes the pupil smaller, so less light enters and the retina is protected from damage.
The iris makes the pupil smaller, so the light is focused on the fovea for more detailed vision.
The lens becomes thinner, so less light is refracted and the retina is protected from damage.
The iris makes the pupil larger, so more light enters and the retina can detect the stage clearly.
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.