TED Talks
R.A. Mashelkar: Breakthrough designs for ultra-low-cost products
Engineer RA Mashelkar shares three stories of ultra-low-cost design from India that use bottom-up rethinking, and some clever engineering, to bring expensive products (cars, prosthetics) into the realm of the possible for everyone.
SciShow
Microscope: The Tube That Changed the World
Humans have long known that glass bends light. However, it took us awhile to figure out that stacking lenses in a tube would open up a whole new world to science, finally allowing us a peek at the microscopic.
SciShow
Microscope The Tube That Changed the World
Humans have long known that glass bends light. However, it took us awhile to figure out that stacking lenses in a tube would open up a whole new world to science, finally allowing us a peek at the microscopic.
Curated Video
Concave
Curving inwards, like the inside of a bowl. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce abstract concepts and...
Curated Video
Convex
Curving outwards, like the outside of a ball or boundary of a circle. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...
Curated Video
Telescopes
Telescopes have enabled us to truly see the wonders of the Universe. Who invented them and how have they developed throughout history? Physics - Universe - Learning Points. The first optical telescopes were made around 1608. Early...
Curated Video
GCSE Physics - How Lenses Work #69
This video covers - The difference between convex and concave lenses - What 'principal focus' and 'focal length' are - The difference between real and virtual images Exam board specific info: AQA - Separate science only IGCSE Edexcel -...
Curated Video
GCSE Physics - How to Draw Ray Diagrams #70
This video covers: - How to draw ray diagrams for convex and concave lenses - How to comment on whether an image is real or virtual, upright or inverted, and bigger or smaller than the object. Exam board specific info: AQA -...
Curated Video
Magnification: Understanding Lens Images and Object Height Ratio
This video is a lecture on magnification, specifically how the height of an image produced by a lens can be compared to the height of the object. The video discusses the two types of lenses, concave and convex, and how they produce...
Let's Tute
Understanding Myopia and Hyperopia: A Guide to Short and Long Sightedness
This video explains myopia and hyperopia, commonly known as short and long-sightedness. The video effectively explains the science behind these conditions and how they can be corrected with the use of concave and convex lenses.
Curated Video
Understanding Lens Formation Using Radar Diagrams
The video is about using radar diagrams (also known as ray diagrams) to investigate how the type of lens used and the distance between the lens and object affect the formation of an image. The video shows four different ray diagrams,...
Curated Video
Understanding Convex and Concave Lenses
This video provides an introduction to the structures and actions of two different types of lens - convex and concave lenses. The video also explains the focal length of each type of lens and how to obtain the principal focus for each.
Let's Tute
Understanding Concave and Convex Lenses through Simulation
This video explains the concepts of myopia and hyperopia and how they can be corrected using concave and convex lenses. It also provides a simulation tool to help students understand the focal length, position, nature, and size of images...
msvgo
Spherical Lenses
It explains two types of spherical lenses; convex and concave lenses. It also explains technical terms related to them.It also describes the converging property of convex lens and diverging property of concave lens.
msvgo
Refraction at a spherical surface
It expresses the lens maker formula and lens formula,explains refraction by lens,power of lens,combination of thin lenses in contact.
Curated Video
Understanding Concave Lenses: Formation and Types of Images
This video is an educational lecture that explains the properties of concave lenses, how they form images, and the type of images they create. The video describes the definition of a lens and how it refracts light as it crosses the...
Curated Video
How Do Lenses Work?
This video provides a basic understanding of lenses, explaining how they work to focus light and form images. It covers the different types of lenses, their uses in various devices, and even highlights how our own eyes function as...
Curated Video
Convex Lenses: Refraction and Image Formation
The video is a lecture on convex lenses, explaining the way they work to bend and focus light. The speaker defines what a lens is, describes how convex lenses function, explains how to construct a ray diagram with a convex lens, and...
Visual Learning Systems
Using Light: Concave and Convex Lenses
This video examines the various uses of light and the role of different types of lenses in light refraction. The way in which eyeglasses, contact lenses, and binoculars manipulate light to allow us to see better is illustrated. Other...
Mazz Media
Using Convex Lenses to Magnify
Using animation and real world examples, this video explores the change in kinetic energy of particles with heating and cooling that produces expansion and contraction and change in density in matter. Students will observe and come to...
Curated OER
Physics Lab Demo : Optics Light Box
Use a light box to experiment with light rays. The teacher uses prisms, convex, and concave lenses to refract light rays. Get your physics class excited about reflection and refraction by showing this video before you have them...
Khan Academy
Khan Academy: Camera Lenses
Now we'll add a lens to our camera and explore the idea of an f-stop.
Khan Academy
Khan Academy: Algebra of Focus
In this video we develop a formula which tells us how big the circles of confusion are when an object is out of focus.
Khan Academy
Khan Academy: Waves and Optics: Object Image Height and Distance Relationship
Explores the relationship between the height of an object and the height of its image through a convex lens, and relates this to the ratio of their distances from the lens. [2:22]