Lens Essay

is defined as an opacity of the lens of the eye that causes partial or total blindness. The word is derived from the Latin "cataracta", which means "waterfall.” To the eye of an observer, the foamy white opacity of an advanced cataract resembles that of the turbulent water of a waterfall. (Chang, Cataracts Definition, 2014) Etiology The lens is a naturally clear, transparent, and avascular structure located behind the iris. Light passes through the transparent lens to the retina to produce clear

through the glass lens and the different colours that make up white light refract at different angles. This causes the observer to see a rainbow around the image they are viewing. One way to counteract the effects of chromatic aberration is to use multiple compensating lenses. Another way to avoid chromatic aberration is to use a long object focal length this is the distance between the focus and the objective Another disadvantage is the difficulty of making the lenses. The objective lens need to have

named flea glasses. The combining of the glass leads to the contribution of the compound microscope created by Zacharias Jansen in the late 1500’s. Those lenses were bi-convex (both sides of the lenses curved) and plano-convex; (one side of the lens curved and the other side plane). Zacharias, a spectacle maker from Middleburg Holland added the lenses in three small tubes, similar to the binoculars of today except a third row was added to a draw tube that slid in and out to allow focusing.

curve of the cornea (the front of the eye or the clear, round dome covering the eye's iris and pupil). The cornea and lens are generally even and rounded equally in all directions. This mechanism helps the eye to focus light emissions sharply against the retina at the back of the eye. In the cornea of an average eye the lens focuses light waves on the retina. If the cornea or lens isn't smooth and equally rounded the light waves will not be refracted properly. This is stated as an inaccuracy in the

you would want to use an angled or straight spotting scope. Once you have selected the brand you can delve upon finding the right magnification power which can usually be measured in terms of two numbers. The first number specifies the power of the lens and the second specifies the diameter. The next step would be to consider the weight of

OBJECTIVE LENS J TRANSVERSE CONTROL KNOB E STAGE K FINE ADJUSTMENT F DIAPHRAIGM L CASE ADJUSTMENT Microscopy Use and Function Exercise 2: Illuminated Pocket Microscope Questions A. Draw the image of the root tips as viewed at 200X. See attached page for actual sketches B. Label the diagram of the pocket microscope in Figure 4. Use the following terms: eyepiece,

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

microscope and prepare a wet-mount slide? Hypothesis: A compound microscope is being used properly when the light source, nosepiece lens, and eyepiece lens work together to bring a magnified image to one’s eye. A wet-mount is properly prepared when a drop of liquid containing the sample is placed between the slide and a thin glass coverslip. Materials: Compound Microscope Lens Paper Prepared Slide Scissors Newspaper Microscope Slide Dropper Pipette Coverslip Dissecting Probe Procedure: The microscope

Background knowledge: The topic of this investigation is to compare and contrast three different optical telescope systems that are used in modern day times. The three main telescope systems that will be focused on in this report will be reflecting, refracting and cassegrain which is a combination of both and how different types of error such as aberration effect the telescopes ability to capture an image and the quality of the image it produces. Reflecting telescopes use mirrors to reflect incoming

Introduction Imagine yourself standing on one of the seven wonders in the world. Surrounded by the symbolic scenery you wish to seal up the beauty forever, but you’re struggling due to a lack of knowledge of how to function a DSLR (digital single lens reflex) camera. This user guide will teach you how to use a DSLR camera from the fundamentals, along with in-depth knowledge of the profession functions using the three most important pillars in photography; Aperture, Shutter speed and ISO. Automatic