W3 Lens Curvature

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4 Terms

1
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What is the structure of a spectacle lens?

MOST have a positive front surface and a negative back surface

2
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What is curvature?

The reciprocal of the radius of curvature (metres)

3
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What is the relationship between curvature and surface power?

Greater the curvature higher the surface power

4
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What do we assume n’ to be when using lens measure?

1.523, this however reduces accuracy