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GCSE Physics · key term
A transparent optical component that forms an image by refracting light at its surfaces.
Used by AQA and Edexcel
Specification 4.6.2.5 · Paper 2
A transparent object that forms an image by refracting light.
Revise: LensesA lens refracts light as it enters and leaves its curved surfaces. Rays from one point on an object can therefore be brought together, or made to spread out as though they came from another point. That point is part of the image.
Specification 5.4P, 5.5P · Paper 1
Revise: Lens PowerA lens forms an image by refraction. Light changes direction at each curved boundary as it passes from air into the lens and then back into air. The directions of these changes combine to make rays converge towards the principal axis or diverge away from it.
A transparent optical component with curved surfaces that changes the direction of light by refraction.
Do not assume every convex-lens image is real. Check whether the refracted rays actually meet.
Do not confuse lens power in dioptres (D) with power as a rate of energy transfer in watts (W).
When explaining shape, link the full chain: greater curvature causes stronger refraction, giving a shorter focal length and therefore a greater magnitude of lens power.
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