AQA GCSE Physics · 8463
Specification 4.6.2.5 · Paper 2
A lens that brings rays travelling parallel to its principal axis together.
Revise: LensesFor a convex lens, rays entering parallel to the axis meet at the focus on the far side.
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GCSE Physics · key term
A lens that is thicker in the middle and makes parallel rays converge towards a principal focus.
Used by AQA and OCR
Specification 4.6.2.5 · Paper 2
A lens that brings rays travelling parallel to its principal axis together.
Revise: LensesFor a convex lens, rays entering parallel to the axis meet at the focus on the far side.
Specification P5.3c · Paper 2 (Foundation), Paper 4 (Higher)
A lens that is thicker in the middle than at its edges and makes parallel rays converge.
Do not state that a convex lens always magnifies: the image may be larger, the same size or smaller depending on the object's distance from the lens.
Remember the correction pairings: a concave lens corrects short-sightedness; a convex lens corrects long-sightedness.
Distinguish the lens shapes and actions: a convex lens converges parallel rays, whereas a concave lens diverges them.
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A convex lens is thicker in the middle than at its edges. Rays arriving parallel to the principal axis are refracted towards the axis and meet at the principal focus on the far side. It is therefore a converging lens.
Paper 1, Paper 2
Revise: Reflection, Refraction and LensesA convex lens is thicker in the middle and is also called a converging lens.