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published by the Global Access Broadcasting
content provider: 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.

Please note that this resource requires Flash.
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.
Subjects Levels Resource Types
Education Practices
- Technology
= Multimedia
- Geometrical Optics
= Optical Instruments
= Straight Line Propagation
= Thin Lens
- High School
- Middle School
- Instructional Material
= Activity
= Tutorial
- Audio/Visual
= Movie/Animation
Appropriate Courses Categories Ratings
- Physical Science
- Physics First
- Conceptual Physics
- Algebra-based Physics
- Activity
- New teachers
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Access Rights:
Free access
This material is released under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 license.
Rights Holder:
Mindset Network
convergence, convergence, convex lens, focal point, image formation, lens, ray diagram, real image, virtual image, vision
Record Cloner:
Metadata instance created April 14, 2014 by Caroline Hall
Record Updated:
April 14, 2014 by Caroline Hall
Last Update
when Cataloged:
September 28, 2010

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)

AAAS Benchmark Alignments (2008 Version)

4. The Physical Setting

4F. Motion
  • 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.

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.

Link to Unit:
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Record Link
AIP Format
(Global Access Broadcasting, Johannesburg, 2010), WWW Document, (https://www.youtube.com/watch?v=TroFa0HrA5Q&noredirect=1).
Light and Lenses: Using Lenses to Form Images (Global Access Broadcasting, Johannesburg, 2010), <https://www.youtube.com/watch?v=TroFa0HrA5Q&noredirect=1>.
APA Format
Light and Lenses: Using Lenses to Form Images. (2010, September 28). Retrieved July 15, 2024, from Global Access Broadcasting: https://www.youtube.com/watch?v=TroFa0HrA5Q&noredirect=1
Chicago Format
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 15 July 2024).
MLA Format
Light and Lenses: Using Lenses to Form Images. Johannesburg: Global Access Broadcasting, 2010. 28 Sep. 2010. Mindset Network. 15 July 2024 <https://www.youtube.com/watch?v=TroFa0HrA5Q&noredirect=1>.
BibTeX Export Format
@misc{ Title = {Light and Lenses: Using Lenses to Form Images}, Publisher = {Global Access Broadcasting}, Volume = {2024}, Number = {15 July 2024}, Month = {September 28, 2010}, Year = {2010} }
Refer Export Format

%T Light and Lenses: Using Lenses to Form Images %D September 28, 2010 %I Global Access Broadcasting %C Johannesburg %U https://www.youtube.com/watch?v=TroFa0HrA5Q&noredirect=1 %O application/flash

EndNote Export Format

%0 Electronic Source %D September 28, 2010 %T Light and Lenses: Using Lenses to Form Images %I Global Access Broadcasting %V 2024 %N 15 July 2024 %8 September 28, 2010 %9 application/flash %U https://www.youtube.com/watch?v=TroFa0HrA5Q&noredirect=1

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Light and Lenses: Using Lenses to Form Images:

Is Associated With Light and Lenses: Images

This is the first of the 4-part series "Light and Lenses". It introduces the concept of image formation.

relation by Caroline Hall
Is Associated With Light and Lenses: Images and Convex Lenses

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.

relation by Caroline Hall

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