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2. Diaphragm (optics) - Wikipedia

   en.wikipedia.org/wiki/Diaphragm_(optics)

   Nine-blade iris Pentacon 2.8/135 lens with 15-blade iris Aperture mechanism of Canon 50mm f/1.8 II lens, with five blades In the human eye, the iris (light brown) acts as the diaphragm and continuously constricts and dilates its aperture (the pupil) A 750nm titanium-sapphire laser beam passing through an iris diaphragm, while opening and closing the iris.

3. 10 Things To Know Before Using Costco Optical - AOL

   www.aol.com/10-things-know-using-costco...

   Many online sources report that the average cost of lenses and frames at Costco Optical is around $185, which is lower than what VisionCenter.org notes is the average price range for new glasses ...

4. Condenser (optics) - Wikipedia

   en.wikipedia.org/wiki/Condenser_(optics)

   Condensers typically consist of a variable-aperture diaphragm and one or more lenses. Light from the illumination source of the microscope passes through the diaphragm and is focused by the lens(es) onto the specimen. After passing through the specimen the light diverges into an inverted cone to fill the front lens of the objective.

5. Bright-field microscopy - Wikipedia

   en.wikipedia.org/wiki/Bright-field_microscopy

   A bright-field microscope has many important parts including; the condenser, the objective lens, the ocular lens, the diaphragm, and the aperture. Some other pieces of the microscope that are commonly known are the arm, the head, the illuminator, the base, the stage, the adjusters, and the brightness adjuster.

6. The 9 Best Sale Items at Costco Right Now - AOL

   www.aol.com/9-best-sale-items-costco-200246923.html

   $5.50 off each 24-pack of 16.9-ounce bottles. If you're tackling Dry January, San Pellegrino sparkling mineral water is a great way to mix things up.The 24-pack of 16.9-ounce bottles is $5.50 off ...

7. 8 Costco Sale Items To Buy Before They Sell Out This March - AOL

   www.aol.com/finance/8-costco-sale-items-buy...

   You can often find food at Costco on sale, and that includes corned beef. “Costco offers Morton’s of Omaha Corned Beef for $5.49 per pound, ...

8. Objective (optics) - Wikipedia

   en.wikipedia.org/wiki/Objective_(optics)

   Two Leica oil immersion microscope objective lenses; left 100×, right 40×. The objective lens of a microscope is the one at the bottom near the sample. At its simplest, it is a very high-powered magnifying glass, with very short focal length. This is brought very close to the specimen being examined so that the light from the specimen comes ...

9. Oil immersion - Wikipedia

   en.wikipedia.org/wiki/Oil_immersion

   The refractive indices of the oil and of the glass in the first lens element are nearly the same, which means that the refraction of light will be small upon entering the lens (the oil and glass are optically very similar). The correct immersion oil for an objective lens has to be used to ensure that the refractive indices match closely. Use of ...