Lecturer’s name : Mr. Zikri Introduction An optical lens is made of transparent material such as glass or clear plastic. One or both surface usually has a spherical curve. There are two types of lenses‚ converging and diverging lens. A converging lens is called a convex lens. It is thicker at the centre than at the edges. A diverging lens is called a concave lens. It is thinner at the centre than at the edges. For a convex lens‚ light rays parallel and close to the principal axis are refracted
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ocular micrometer constant‚ the objective lens constant can be known from the product of the ocular micrometer constant and the eyepiece magnification. The magnification of the illustration can be derived using the monocot root slide. Finally‚ when these constants are obtained‚ the magnification of the drawing is obtained. After calibration and computations‚ the following findings have been derived: Ocular micrometer constant 0.01 mm Objective lens calibration 1 mm Size of metaxylem 11
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Other major types of microscopes are the electron microscope (both the transmission electron microscope and the scanning electron microscope) and the various types of scanning probe microscope. Microscope 1. An optical instrument‚ consisting of a lens‚ or combination of lenses‚ for making an enlarged image of an object which is too minute to be viewed by the naked eye. Parts and Specifications Historians credit the invention of the compound microscope to the Dutch spectacle maker‚ Zacharias
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images. When using a converging lens‚ it’s helpful to remember these rules of thumb. If the object is very far away‚ the image will be tiny and very close to the focal point. As the object moves towards the lens‚ the image moves out from the focal point‚ growing as it does so. The object and image are exactly the same size when the object is at 2F‚ twice the focal distance from the lens. Moving the object from 2F towards F‚ the image keeps moving out away from the lens‚ and growing‚ until it goes to
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accommodation of the eye? Ans. The ability of the eye lens to adjust its focal length‚ so as to clearly focus rays coming from distant as well a near objects on the retina‚ is called the power of accommodation of the eye. Q2. A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision? Ans. A person with a myopic eye should use a concave lens of focal length 1.2 m so as to restore proper vision
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Chapter 14 Outline I. Refraction of Light A. Refraction is the bending of light at the boundary of two media. 1. It is caused by differences in the way light travels in the two media a) Light changes speed unequally. (1) One side of the light becomes slower/faster 2. If light is perpendicular to the new medium‚ light will not refract a) If the media have the same index of refraction‚ light will not refract B. Index of Refraction 1. How well light travels through a medium is measured by
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A ground breaking new tool used to study the heavens was introduced in the 17th century. This tool was known as the telescope. It revealed the cosmos in a different way than our naked eye could ever perceive. The telescope opened doors to countless stars‚ nebulae‚ galaxies‚ and a slew of never before seen wonders. With its creation came limitations and caused the need to improve and upgrade the methods in which the telescope functioned and find new ways of viewing the heavens.There are three main
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toothpick away. 5. Stand a thin glass cover slip on its edge near the drop of dye. 6. Slowly lower the other side of the cover slip until it covers the dye completely. Make sure there are no air bubbles. 7. Make sure the lowest power lens (the shortest lens) is in place over the stage. Place the slide onto the stage of the microscope. 8. Look through the eyepiece and turn the coarse focus knob (the largest knob) until an image comes into focus. It should look like scattered blobs. Move the slide
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the side that lets you check to see what power the lens is. 6- Len stop-Aperture against which the lens rests. 7- Cylinder axis wheel 8- Filter level-Used to engage or remove green filter. 9- Lamp access cover- Provides access to change the lensmeter bulb. 10- Locking lever — Used to elevate or depress the position of the instrument for individual’s height or posture 11- Power drum– The large wheel used to find the power of the lens. It is marked with power ranging from –20 to + 20
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to allow more or less light. It is typically a plastic disk located between the light source and the specimen mount. The compound microscope has two systems of lenses for greater magnification‚ 1) the ocular or eyepiece lens that one looks into and 2) the objective lens‚ or the lens closest to the object. A microscope works by using lights‚ mirrors‚ and glass to magnify. The mirrors and glass bend the light in a certain way that it makes small objects appear larger. Method Procedure 1.2 Handling
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