A person's lens has become less elastic. The ciliary muscles contract normally when the person looks at a nearby object, but the lens remains too thin.
Which explanation identifies why the object is blurred and how spectacles can help?
Refraction is insufficient; a concave lens decreases convergence before light enters the eye.
Refraction is excessive; a convex lens increases convergence before light enters the eye.
Refraction is excessive; a concave lens decreases convergence before light enters the eye.
Refraction is insufficient; a convex lens increases convergence before light enters the eye.
42 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.