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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JAMES WEBB SPACE TELESCOPE Lachlan Milligan Part 1: Research of an Optical Instrument or Device The James Webb Space Telescope (JWST)‚ named after James Webb who played a pivotal role in the Apollo program‚ is renowned for replacing the Hubble space telescope due its uncontested visibility (HubbleSite‚ 2015)‚ created by modern technology. The JWST cost $8.7 billion US (NASA JWST‚ 2016) and is scheduled to be launched in October 2018 and will offer unparalleled resolution from long-wavelength
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meaning “seeing”. The telescope is an optical instrument for making distant objects appear larger and nearer. Refracting telescopes consist of an objective lens set into one end of a tube and an adjustable eyepiece or a combination of lenses set into the other end of the tube and the enlarged object is viewed directly. A reflecting telescope has a concave mirror that gathers light from the object and focuses it into an adjustable eyepiece or combination of lenses through which the reflection of the
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The focal length of convex mirror Date of exp: 16/1/2015 Sub group: Ali Emad - mobeen jafer - mortadha abd al-aaly Apparatus Convex mirror and holder‚ small plane mirror and wooden clamp Convex lens and holder. two mounted pins‚ metre rule or optical bench. Method: Place a mounted pin at a distance from the convex lens greater than the focal length so that a real image of the pin is produced. Locate this image by means of the second pin. Place the convex mirror between this second pin
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Telescopes A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation such as visible light. The first known practical telescopes were invented in the Netherlands at the beginning of the 17th century‚ using glass lenses. They found use in terrestrial applications and astronomy. Telescopes come in all shapes and sizes‚ from a little plastic tube you buy at a toy store for $2‚ to the the Hubble telescope which weighs several tons. Amateur telescopes
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LIMITATION OF SIGHT AND HEARING INTRODUCTION Humans have sight and hearing limitation. Without any devices‚ our sight and hearing was limited. Most of the limitation of sight can be overcome with the help of certain optical instruments such as magnifying glass‚ microscope‚ binoculars and others. The range of frequency of hearing in human 20 Hz to 20 000 Hz. It was different according to the age of a person. Hearing limitations can be overcome by using devices such as microphone‚ stethoscope‚ earphone
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power than a light-powered optical microscope‚ because it uses electrons that have wavelengths about 100‚000 times shorter than visible light (photons)‚ and can achieve magnifications of up to 1‚000‚000x‚ whereas light microscopes are limited to 2000x magnification. The electron microscope uses electrostatic and electromagnetic "lenses" to control the electron beam and focus it to form an image. These lenses are analogous to‚ but different from the glass lenses of an optical microscope that form a magnified
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Principle of Sight Optical telescopes are divided into two basic categories: refracting telescopes and reflecting telescopes. Refracting Telescopes Refracting telescopes utilize a system of lenses that collect and refract light to magnify the image (Figure ). They have a larger diameter lens called the objective lens and a small lens called an eyepiece. Good refracting telescopes utilize multiple lens systems to correct for color aberrations. Chapter discusses lenses in the section on “Stations
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glass or plastic lenses that were primarily meant to reduce brightness. Darker lenses were considered to be better because they screened out more light. As our understanding of the damaging nature of sunlight evolved‚ the need for better eye protection was recognized‚ and technology was developed to help sunglasses better screen out the harmful rays of the sun‚ especially UV rays. From inexpensive models with plastic lens and frames to costly designer brands with ground glass lenses and custom-made
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Reflecting Telescope Telescope A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light). The first known practical telescopes were invented in the Netherlands at the beginning of the 17th century‚ using glass lenses. Today‚ the reflecting telescope is considered as one of the most powerful scientific instruments ever invented. Within a few decades‚ the reflecting telescope was invented‚ which used mirrors. In the 20th
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