the Global Access Broadcasting
the Mindset Network
This 15-minute video is the second in a series on how light interacts with lenses to form images. Through narrated demonstrations and animated models, the video takes a deep look into light refraction by convex lenses. It also instructs on how to draw ray diagrams and use them to determine the size, position, and nature of images formed through convex lenses. This video is one of a four-part series on light and images, developed to promote deep understanding of light and matter interactions through use of narration, animation, and video clips depicting phenomena in action. See Related Materials for a link to the companion videos.
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Editor's Note:Why we like this resource: it does a remarkably good job of depicting how a convex lens converges incident rays of light. The professional scripting, production, and editing serve to maintain a pacing that is suitable for novice learners. If your students don't get real vs. virtual image prior to seeing the video, they will leave with a much deeper understanding.
convergence, convergence, convex lens, focal point, image formation, lens, ray diagram, real image, virtual image, vision
Metadata instance created
April 14, 2014
by Caroline Hall
April 14, 2014
by Caroline Hall
Last Update when Cataloged:
September 28, 2010
AAAS Benchmark Alignments (2008 Version)
4. The Physical Setting
3-5: 4F/E3. Light travels and tends to maintain its direction of motion until it interacts with an object or material. Light can be absorbed, redirected, bounced back, or allowed to pass through.
6-8: 4F/M5. Human eyes respond to only a narrow range of wavelengths of electromagnetic waves-visible light. Differences of wavelength within that range are perceived as differences of color.
6-8: 4F/M8. There are a great variety of electromagnetic waves: radio waves, microwaves, infrared waves, visible light, ultraviolet rays, X-rays, and gamma rays. These wavelengths vary from radio waves, the longest, to gamma rays, the shortest.
Next Generation Science Standards
Disciplinary Core Ideas (K-12)
Electromagnetic Radiation (PS4.B)
When light shines on an object, it is reflected, absorbed, or transmitted through the object, depending on the object's material and the frequency (color) of the light. (6-8)
The path that light travels can be traced as straight lines, except at surfaces between different transparent materials (e.g., air and water, air and glass) where the light path bends. (6-8)
Information Technologies and Instrumentation (PS4.C)
Multiple technologies based on the understanding of waves and their interactions with matter are part of everyday experiences in the modern world (e.g., medical imaging, communications, scanners) and in scientific research. They are essential tools for producing, transmitting, and capturing signals and for storing and interpreting the information contained in them. (9-12)
Crosscutting Concepts (K-12)
Cause and Effect (K-12)
Cause and effect relationships may be used to predict phenomena in natural or designed systems. (6-8)
Systems and System Models (K-12)
Systems may interact with other systems; they may have sub-systems and be a part of larger complex systems. (6-8)
Models can be used to represent systems and their interactions—such as inputs, processes and outputs— and energy, matter, and information flows within systems. (6-8)
Science is a Human Endeavor (3-12)
Advances in technology influence the progress of science and science has influenced advances in technology. (6-8)
This resource is part of a Physics Front Topical Unit.
Topic: Nature and Behavior of Light Unit Title: Microscopy and Optical Devices
2nd in series of four well-executed videos on how light interacts with lenses to form images. This one takes a deep look at light refraction by convex lenses. Appropriate for high school, but the first half could be adapted for middle grades. If your students don't get how incident light rays can converge to a point, they will gain a solid understanding from this video.
Mindset Network. Light and Lenses: Using Lenses to Form Images. Johannesburg: Global Access Broadcasting, September 28, 2010. https://www.youtube.com/watch?v=TroFa0HrA5Q&noredirect=1 (accessed 30 June 2015).
%0 Electronic Source %D September 28, 2010 %T Light and Lenses: Using Lenses to Form Images %I Global Access Broadcasting %V 2015 %N 30 June 2015 %8 September 28, 2010 %9 application/flash %U https://www.youtube.com/watch?v=TroFa0HrA5Q&noredirect=1
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This is Part 3 of the Light and Lenses series. It deeply explores how ray diagrams can be used to determine the position and size of images produced by convex lenses and demonstrates how to calculate magnification in a lens.