An astronomer notices that a faint star is easier to detect when she looks just beside it rather than directly at it.
Name the two types of light receptor cell found in the retina.
Give two differences between these two types of receptor cell in terms of their distribution across the retina and the detail of the vision they provide.
Explain why the faint star is easier to detect when the astronomer looks just beside it.
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.