A quick tutorial of how lenses form images and the concept of magnification made to support the course "Engineering Optics" at Oklahoma State University
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What you know, is what you can see with your own eyes. What you can not know, you rely on scientists, to provide you with answers. What you can see, is the Sun and the Moon, and the passage of day into night, ad infinitum. You see a blue sky with a bright sun and clouds during the day, and a dark sky with stars and a glowing Moon at night. The Sun and the Moon appear the same size, but you have been told they are not. Our Sun star is 865000 miles in mean diameter (or, 109 Earths wide), while our Moon is merely 2159 miles in diameter (or, one fourth the size of Earth). On average, the Sun is 92955807 miles from Earth, while the Moon, on average, remains only 238857 miles away. Despite obvious fluctuations and eccentricities of orbit, by both bodies, the important question, is why does the Sun and Moon appear the same size in the sky? Scientists will explain, that mathematically it is quite astonishing that such a balance of ratio exists in our current situation on planet Earth. Perhaps this unique relationship, when studied in more mathematical detail, might yield results highlighting the golden ratio phi. But that is almost considered trivial when faced (quite literally) with the actual reality. The reality is that you have been mis-taught, and misled. You have been lied two by a conspiracy of science, of thought and visualization perspective. The true reality, is that Planet Earth resides rather close to its Sun star, although it may not appear that way. If you were in ...
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This is part of my science project for optic. I used c4d to make the animations and sony vegas for the final movie
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Modeling convex and concave spherical lens from two fragments of spheres (for the main surface of the lens) and a thin cylinder between them used to close the internal space of the lens.
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Ray tracing diagram for a converging lens, with the object inside the focal length. (yes, the light actually bends at both surfaces, not the middle of the lens...) This video was made with a Samsung Document Camera (pretty much a digital video camera on a stick)
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Physics: Introduction to the optics of lenses and mirrors. Concave, convex, converging, diverging; real, virtual; upright, inverted, magnified, shrunk. Sign conventions for focal length, image distance, object distance, magnification. The lens/mirror equation; the magnification equation. Introduction to ray tracing. This is arecording of a tutoring session, posted with the student's permission. These videos are offered on a "pay-what-you-like" basis. You can pay for the use of the videos at my website: www.freelance-teacher.com For printable documents containing the "handout" and problems discussed in this video series, go to my website. For a list of all the available video series, arranged in suggested viewing order, go to my website. For a playlist containing all the videos in this series, click here: www.youtube.com (1) The lens/mirror equation. Focal length distance, object distance. Convex, concave, diverging, converging (2) Image distance. Real, virtual (3) Continued. Magnified, shrunk (4) Continued. Upright, inverted (5) Continued. Magnification equation (6) Continued. The lens/mirror chart (7) A problem (8) Continued. Ray tracing (9) Continued (10) Another problem (11) Continued
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We used a raybox to show how a concave lens causes rays to move apart. We also showed how a convex lens brings rays to a focus.
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Physics: Introduction to the optics of lenses and mirrors. Concave, convex, converging, diverging; real, virtual; upright, inverted, magnified, shrunk. Sign conventions for focal length, image distance, object distance, magnification. The lens/mirror equation; the magnification equation. Introduction to ray tracing. This is arecording of a tutoring session, posted with the student's permission. These videos are offered on a "pay-what-you-like" basis. You can pay for the use of the videos at my website: www.freelance-teacher.com For printable documents containing the "handout" and problems discussed in this video series, go to my website. For a list of all the available video series, arranged in suggested viewing order, go to my website. For a playlist containing all the videos in this series, click here: www.youtube.com (1) The lens/mirror equation. Focal length distance, object distance. Convex, concave, diverging, converging (2) Image distance. Real, virtual (3) Continued (4) Continued. Upright, inverted (5) Continued. Magnification equation (6) Continued. The lens/mirror chart (7) A problem (8) Continued. Ray tracing (9) Continued (10) Another problem (11) Continued
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Boredom compelled me to burninate things with a giant convex lens. Notice how the buttercup takes almost twice as long to light as the dandelion that has gone to seed. It has much better heat dissipation qualities I guess.
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The experiment to determine focal length of a concave lens using a convex. say thaanks ! :D
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Although Galileo has historically been credited with the invention of the refracting telescope in the early 1600s, credit should be given to three eye doctors whose work helped him develop the theory of refraction for his telescope. Refracting telescopes are very simple and have only two main components -- a convex lens called the objective lens, and a concave lens that makes up the eyepiece.
The convex lens is located at the end of the telescope and serves to refract or bend the light that enters the telescope and turn it into a single beam of light. Then the image you are looking at shows up in reverse on the concave lens, which turns the image around. Refraction telescopes allow the viewer to see very bright and clear images.
The refracting telescope invented by Galileo is used today by many people but the drawback is the small field of view it offers. A well known refracting telescope is the one in California at the Chabot Space and Science Center. The center actually has two refracting telescopes -- an eight-inch refracting telescope and a 21-inch refracting telescope. They are very basic telescopes and therefore spherical aberrations can occur. One way these aberrations are dealt with is by using a pair of lenses (a convex and a flat lens) to create an achromatic lens.
Refracting Telescopes and Color
One of the most common issues with a refracting telescope is the separation of light that occurs when the light is bent. When this happens, it is called chromatic aberration and it can be remedied with the use of an achromatic lens.
One problem with large refracting telescopes is getting the lens large enough without any imperfections that will be picked up as light goes through the lens. There are 41-inch lenses but they are unusable. Refracting telescopes are generally not used by professional astronomers due to the issue of getting all the light to focus in on one place at the same time.
Refracting telescopes are popular among novice astronomers and are utilized at observatories around the world. It is a good telescope choice for beginners due to the lens being enclosed that makes the image appear to be less shaky and have less movement than reflecting telescopes, which send the image to the viewer's eye from a mirror. The process of reflecting light from the first mirror to the second and then the eye piece can cause an unsteady image.
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Close up video of my Lenovo x200t keyboard taken with Sony-Ericsson Vivaz with convex lens placed in front of it's camera.
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901 Cree Q3-WC 3-Mode 130-Lumen Convex Lens Zooming LED Flashlight www.lightake.com Color: Black Model: 901 Emitter Brand/Type: Cree Emitter BIN: Q3-WC Color BIN: White Lens diameter: 34.4mm Length: 134.5mm Weight (including the packing): 147.0g
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image formed by convex mirror for CBSE Class X, image formed by convex mirror
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This is the 4th lesson in the series, "Light and Lenses." It describes the nature, size and position of an image formed by a concave lens. The lesson also describes how lenses are used to help people with different eye conditions. Source: Mindset Network
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