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Science glossary film: Focus

Focus

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In optics, the point at which rays of light converge after refraction or reflection, and so the point at which a sharp image will be produced.

In optics, the point at which rays of light converge after refraction or reflection, and so the point at which a sharp image will be produced. Because different wavelengths of light are refracted differently, a lens will not bring all colours of light to focus at quite the same point, leading to a slight blurring. Mirrors do not have this problem.

Because different wavelengths of light are refracted differently, a lens will not bring all colours of light to focus at quite the same point, leading to a slight blurring. Mirrors do not have this problem.

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