A student is in a classroom with a view of a distant tree outside. They are given a convex lens, a lens holder, and a white cardboard screen. Describe how the student can produce a sharp image of the tree on the screen.
24 exam-style questions on Edexcel GCSE Physics 5.1 Reflection, refraction and lenses (physics only). Each one has a worked solution and a mark scheme showing where the marks go.