Zoom lens

Chart Note 4.2 Comes to the office today for Botox injections. He has a very significant and rather severe left-sided hemifacial spasm. Informed consent was obtained from the patient. Under sterile conditions, he received a total of 78.75 units of Botox. Location and dosages of injections are documented on his injection form. He tolerated these well. No complications were noted. He will follow up in 3 months when further injections are needed. He is to call the office in 2 weeks and let us know

mentioned in the writings of the two Roman philosophers, Seneca and Pliny. Apperantly, maginfiers weren't really used much until the invention of the spectacles. The oldest actual microscope was actually just a tube with a plate at one end and a glass lens at the other end. They magnified

the microscope. This lab showed me what materials and parts of the microscope I should use when examining an object. Introduction The microscope was invented by a father and son, Hans and Zaccharias Janssen. They were once looking at the lens of a magnifying glass and decided to put the lenses in a tube. When they looked through the tube, they noticed that the object underneath the magnifying lenses, was enlarged. That was the first invention of the compound microscope. Overtime, more advancements

telescope. Schmidt-Cassegrain telescopes (SCT) are a catadioptric design, meaning they use both lenses and mirrors. SCTs are primarily reflecting telescopes, but they use a corrector lens to eliminate aberrations that would result from the mirror design alone. In an SCT the incoming light passes through the Schmidt corrector lens (also called a corrector plate) at the front of telescope. It is reflected from a concave primary mirror at the back of the scope which focuses the light to the front of the telescope

assistants have a lot more to do than just spinning a disc which is attached to a lens for 12 hours a day, but this single act deserves the applause being the most remarkable contribution that one makes to a film. Today we will

cataract surgery over the years the advantages and disadvantages plus on certain occasions the masterminds behind the innovations. Firstly it’s important to define cataract; a cataract is a cloudiness or opacity in the normally transparent crystalline lens of the eye. This cloudiness can cause a decrease in vision and may lead to eventual blindness. The word cataract has been derived from Greek origin which means waterfall. The original name was of Latin medicine but was lost in translation of Arabic

Zeiss] The microscope uses a compound lens which allows to get maximum magnification. The compound lens is made up of multiple lenses that have a common axis, allowing for a high magnification to be possible. The microscope consists of objective lens and eyepiece. The objective lens is a vital part of a microscope since the lens provides a few different variations of power for magnification, and the eyepiece magnification power helps multiply the objective lens power, which will create a large amount

Aperture is a hole within a lens, where light travels into its body. Depth of Field is the area of the image that looks clear. The aperture impacts the depth of field directly, the larger the aperture and vice versa, the larger the depth of field. For the picture above, as the aperture gets smaller, the depth of field gets smaller, thus smaller amounts of the picture appears clearer. As for the picture below, as the aperture gets bigger, lesser amounts of light is exposed to the camera, thus the

The refractor telescope has many advantages and disadvantages. One of the disadvantages is that the lenses are made of glasses therefore it has to be perfect with no air bubbles or scratches in the glass as this will impair the users viewing. Another disadvantage is that lense are weakest around the edges because they are thinnest there and that is the only place they are being supported by the telescope so this can lead to easy breakage. The lense can have colour distortion which means when white

Microscope While some looked to the cosmos, there were others more interested in the smallest details. The discovery of the microscope marked the beginning of modern biology, as this instrument helped boost biological studies and exposed the universe of tiny The Discourse on the Method It is considered as the important work of René Descartes, is a work that seeks to highlight the method to reach true knowledge and find the truth; It is a work that inaugurated modern philosophy. Among its benefits