Edexcel GCSE Physics · 1PH0
Specification 5.4P · Paper 1
Revise: Lens PowerLens power is not the same quantity as power measured in watts. Watts describe the rate of energy transfer; dioptres describe the focusing strength of a lens.
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GCSE Physics · key term
A measure of how strongly a lens converges or diverges light, equal to the reciprocal of its focal length in metres.
Used by Edexcel
Specification 5.4P · Paper 1
Revise: Lens PowerLens power is not the same quantity as power measured in watts. Watts describe the rate of energy transfer; dioptres describe the focusing strength of a lens.
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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