An eye-testing apparatus contains a model cornea and lens, with a screen representing the retina. Parallel light rays entering the model are initially brought to a focus in front of the screen. A trial lens is placed in front of the apparatus and the rays are then focused on the screen.
Which statement explains why the rays now meet at the screen?
The trial lens brings the rays together before they enter the model, so their focus is shifted farther back.
The trial lens brings the rays together before they enter the model, so their focus is shifted farther forward.
The trial lens spreads the rays out before they enter the model, so their focus is shifted farther back.
The trial lens spreads the rays out before they enter the model, so their focus is shifted farther forward.
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.