Monthly Archives: March 2015

Numerical Aperture

Etched onto the barrel of each objective on a microscope, you will find a variety of information. In addition to the magnification and the optical correction (see my article published entitled ‘Looking Down and Looking Through:  The Optics of a …

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Looking Down and Through: Microscope Optics 4: Water Immersion Objectives

Oil immersion objectives are commonly found on most research-grade microscopes (usually 63X or 100X magnification). Immersion objectives increase the resolution of the microscope and increase the numerical aperture (NA) of the lens used (as I alluded to in my previous …

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Women in Science- Progression not Repression

            Undoubtedly women have made many major contributions to science and medicine since ancient times, yet one look at recent news stories will highlight the fact that gender is still an issue for many institutes …

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Looking Down and Through: Microscope Optics 3: Oil Immersion Objectives

Overcoming the limits of optical resolution and increasing numerical aperture (NA) are two of the main problems in light microscopy. I will cover both resolution and NA in other articles, but in brief, the NA of an objective relates to …

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