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  • Card 9 / 9:
    numerical aperture

    a number or measure that expresses the ability of a lens to resolve fine detail in an object being observed. Derived by mathematical formula NA = n sin α, where n is the refractive index of the medium between the lens and the specimen and α = θ / 2

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Source:  OpenStax, College physics: physics of california. OpenStax CNX. Sep 30, 2013 Download for free at http://legacy.cnx.org/content/col11577/1.1
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