” - Wikipedia‚ the free encyclopedia Types of Illusions- 1) Visual Illusions 2) Optical Illusions “The terms visual illusion and optical illusion are often used interchangeably. Visual illusions demonstrate the ways in which the brain fails to recreate the physical world. However‚ unlike visual illusions‚ optical illusions do not result from brain processes. Instead‚ an optical illusion is the perception of a distortion that results from the physical properties of light‚ such
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telecommunications is simply a method of transmitting information from one place to another extremely fast. This is done by shooting pulses of light through an optical fibre. Creating the optical signal involving the use of a transmitter‚ relaying the signal along the fiber‚ ensuring that the signal does not become too distorted or weak‚ receiving the optical signal‚ and converting it into an electrical signal. An optic-fibre is a small fibre no thicker than a human hair‚ either made of glass or plastic that
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Table of Contents Introduction 2 Methodologies 2 Literature Review 3 Wired Connection 3 Dial-Up 3 ADSL/DSL 3 Fiber Optic 4 Wireless Connection 5 Fixed Wireless 5 Wimax 5 Mobile Internet 7 Analysis 7 Findings 8 Advantages 8 Recommendation 9 Conclusion 9 Introduction In the early nineties‚ Bangladesh had access to email via dialup to Bulletin Board Systems (BBS) of a few local providers. The combined Internet users of all the email-only service providers were not
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microscope Stereoscopic microscope Micrometer caliper chronograph A comparison microscope is a device used to analyze side-by-side specimens. It consists of two microscopes connected by an optical bridge‚ which results in a split view window enabling two separate objects to be viewed simultaneously. This avoids the observer having to rely on memory when comHistory In the 1920s forensic ballistics was waiting at its inception. In 1929‚ using
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venture between New Era Partners and Star Light Electronics Ltd. In the past decade‚ Star River has been very successful due its excellent reputation for producing high quality discs. In 1999‚ CD ROM disc drives comprised ninety three percent off all optical disc shipments. This created a high demand and allowed for manufacturing companies of all sizes to enter the market. Due to the oversupply of product‚ CD-ROM prices were pushed down by as much as 40%. Corporate consolidations followed suit but Star
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A TRAINING REPORT ON TELECOM NETWORKS TERII COLLEGE OF ENGINEERING KURUKSHETRA‚ HARYANA GUIDED BY: SUBMITTED BY: Mr. YOGESH Monika Chauhan BSNL‚ KKR ROLL NO. 3509087
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transmitted via mediums such as wires‚ coaxial cables‚ fiber optics‚ or radiated electromagnetic waves such as broadcast radio‚ infrared light‚ microwaves‚ and satellites. Data Communications = Movement of computer information by means of electrical or optical transmission systems Information can be represented using analog signals Analog signals cannot be manipulated easily Analog signals must be digitized for computer processing They must also be presented in binary form for computer processing
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our naked eye. We also cannot see the stars and planets tha tare very far from Earth. Limitation of sight is whereby a person is able to see an object‚ colour‚ shape until a certain extend. Limitations of sight can be overcome by using appropriate optical devices such as microscope‚ telescope‚ periscope and others. Limitation Of Hearing We cannot hear all the sounds around us. The range of frequency of hearing in human is from 20 Hz to 20 000 Hz. It is different according to the age of a person
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step index fiber It is an optical fiber which has a core of constant refractive index.there are two types of step index fibers:single mode si and multi mode si fiber single mode step index fiber has only one mode of EM propagation (HE11) an has a core diameter of about 8-12 Um. and multi mode si has many mode of propagation and has a core of diameter of about 50 Um which allow many no of modes through it. single mode step index has an adv of lower inter modal dispersion as there is only
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the copper cables. These cables are widely used in offices or residential areas. Copper cables transmit information through electrical signals. It has been used as a speaker system wire‚ telephone wire‚ computer cable wire etc. for over years now. Optical fiber comprises of plastic or glass strands to transmit data or information digitally with the use of light rather than electricity. On the other hand‚ copper cable encompasses of a single thread of copper. The size of the cable varies depends upon
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