How to make a telescope

Things You'll Need: * Cardboard Tubes * Glue Guns * Convex And Concave Telescope Lenses 1. Step 1 Acquire a pair of lenses - a large convex lens and a small concave one. (Convex lenses are thicker in the center than at the edge; concave ones are thinner in the center.) 2. Step 2 Find two cardboard tubes that will allow one to slide inside the other. 3. Step 3 Figure out how far apart the lenses should be by looking through the smaller lens while holding the larger one out in front of you. When you can focus on an object in the distance, measure how far it is between the two lenses. 4. Step 4 Double that measurement. The length of the two tubes should be about this long. 5. Step 5 Fasten the larger lens on one end of the wider tube. Hot glue is good for this. 6. Step 6 Mount the smaller lens at the opening of the smaller tube. This is the eyepiece. 7. Step 7 Build a gasket from cardboard or Styrofoam if the tube opening is larger than the lens. 8. Step 8 Make sure the lenses line up with each other. The centers should be in the centers of the tubes and the lenses should be parallel with each other. India Becomes Universal Leader In Space www.freewebs.com www.freewebs.com www.freewebs.com www.freewebs.com

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CARD FRESNEL LENS SOLAR HEATER SUN COLLECTION GREEN ENERGY

www.greenpowerscience.com MONSTER 52" X 40" FRESNEL LENS 3300 DEGREES F. SUPER HOT WATER BOILER 1.3 KILOWATT HEAT ENERGY

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What is a Refracting Telescope?

A refracting telescope uses a lens as its objective to form an image. The refracting telescope was designed for used in a spy glass, but is also used in other devices such as binoculars and telephoto camera lenses.

There are two principles to a refracting telescope, an objective lens and an eyepiece. These two principles gather more light for the human eye and helps to focus and present it in a brighter, clearer, and magnified virtual image. A refractive telescope bends light to cause parallel light rays to converge at a focal point.

Galilean Telescopes are refracting telescopes. Galileo came up with the design in 1608 and uses a convex lens and a concave eyepiece lens. The Galilean telescope magnifies objects up to thirty times. The Galilean telescope was the first telescope to see the planet Jupiter and its moons.

The Keplerian Telescope, invent by Johannes Kepler in 1611 improves upon Galileo's design. The Keplerian Telescope uses a convex lens in opposition to Galileo's concave lens. This allows for a broader field of view and greater eye relief. However, the view is introverted.

An achromatic refractor is a refracting lens which was invented in 1733. The design over came the need for very long focal lengths and used two pieces of glass with different dispersion to limit the effects of chromatic and spherical aberration. Each side of each piece of glass is ground and polished, at which point the two pieces of glass are assembled together. Achromatic lenses bring two wavelengths together and focus them on the same plane.

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Convex mirror - Gương cầu lồi

Convex mirror - Gương cầu lồi

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PHY112 Week 8

This week was mostly about the properties of light. We did experiments to help us understand how light works. We learned about how convex and concave lenses work. There was a change made to project 2, and I hope it makes things a bit easier.

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Ray Diagrams for Lenses

demonstrations.wolfram.com The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily. This Demonstration lets you visualize the ray diagrams for converging and diverging lenses. By manipulating the object and lens locations, you can create real or virtual images. The rays parallel to the principal axis and the ray through the center of t... Contributed by: Ernest Lee

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Cyberphysics - Spectacles

Correction of myopia (short sight) and hypermetropia (long sight) by using glasses - diagrams and calculations.

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