National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Parabola Focal Point
Dr. Math discusses some of the "rules" of parabolas that are specific to the focal point.
Ducksters
Ducksters: Physics for Kids: Lenses and Light
Kids learn about lenses and light in the science of physics including concave, convex, converging, diverging, focal point, meniscus, and Plano lenses.
Physics Classroom
The Physics Classroom: Lesson 3: Concave Mirrors
Lesson 3 of this tutorial on refraction is on concave mirrors. Content that is covered includes the anatomy of curved mirrors, reflection of light and image formation, ray diagrams, image characteristics for concave mirrors, plus more.
Physics Classroom
The Physics Classroom: Image Formation by Lenses
This lesson explains what lenses are, the different between a converging and diverging lens, the difference between a double convex and double concave lens, and gives definitions for terms related to lenses.
CK-12 Foundation
Ck 12: Plix Series: Double Concave Lenses
[Free Registration/Login Required] Change the focal point in this interactive concave lens to see how the focal length changes.After the activity, answer a challenge question to check for understanding.
CK-12 Foundation
Ck 12: Plix Series: Double Convex Lens: Convex Lens
[Free Registration/Login Required] Change the focal point in this interactive convex lens to see how the focal length changes. After the activity, answer a challenge question to check for understanding.
Khan Academy
Khan Academy: Thin Lens Sign Conventions
Have you ever wondered why some people need glasses and others don't? It's because of the way light is focused by the lens in your eye. This lens, like magnifying glasses, eyeglasses, and contact lenses, is considered a thin lens.
United Nations
Unesco: Historic Centre of Florence
This World Heritage website features Florence, a focal point for the Italian Renaissance. Found here are a description, a map, documents, many photos, a video on its significance, and any indicators of threats to its preservation.
United Nations
Unesco: Ferrara, City of the Renaissance, and Its Po Delta
This World Heritage website features Ferrara, a focal point for the Italian Renaissance in the 15th and 16th centuries. Ferrara is known as well as the place where modern town planning began. Found here are a description, a map,...
TeachEngineering
Teach Engineering: Introduction to Environmental Engineering
Students are presented with examples of the types of problems that environmental engineers solve, specifically focusing on air and land quality issues. Air quality topics include air pollution sources, results of poor air quality...
Florida State University
Florida State University: Microscopy Primer: Concave Mirrors: Real Images
Florida State University offers an interactive Java applet demonstrating the object-image relationships for a concave mirror. The position of the object can be dragged along the principal axis and the location, orientation, and size of...
The College Board
College Board: Ap u.s History Ubranization [Pdf]
By 1900, America had become an urban nation in its dominant tone, in its economy and work, and in its culture and aspiration as well as its demography. Gradually-and then seemingly suddenly-cities emerged as the focal points of the...
Other
Center for Technology and Teacher Education: Parabola Lesson Plan
This site is a lesson plan on construction of a parabola using the definition. Geometer's Sketch Pad software is beneficial for the lesson. Through the lesson young scholars develop gemetric constructions of parabolas, use the distance...
Physics Aviary
Physics Aviary: The Way a Mirror Works Lab (Concave)
This lab is designed to have students investigate the relationship between the radius of curvature and the location of the focal point for a mirror like situation.
Khan Academy
Khan Academy: Silver Shekel 2nd Jewish Revolt, Struck Over a Denarius of Hadrian
This silver coin shows how, in an act of defiance against Roman rule, the Jewish population in the province of Judaea over-struck portraits of the Emperor Hadrian with their own symbols. Jerusalem had been destroyed by Roman forces in 70...
Khan Academy
Khan Academy: Italian Gold Ground Painting
Many of the early works in the paintings collection of the J. Paul Getty Museum are altarpieces and fragments of altarpieces made for Italian churches. They were placed above altars and served as the focal point of the Mass. Churches in...
ArtLex
Art Lex: Composition
This online dictionary of art terms from Artlex is a valuable tool. The composition page explains how the term is used in the world of art. There are related links and works of art to explore.
CK-12 Foundation
Ck 12: Physical Science: Lens
[Free Registration/Login may be required to access all resource tools.] What a lens is and what it does, concave and convex lenses.
Georgia State University
Georgia State University: Hyper Physics: Refractive Telescopes
This site from Georgia State University Physics Department gives a discussion of the manner in which light is refracted by refractive telescopes. Discusses the Galielean telescope and the astronomical telescope.
Physics Classroom
The Physics Classroom: Reflection/ray Model of Light: Reflection Rules Concave
Students learn two rules of reflection as it has to do with concave mirrors. These two rules will greatly simplify the task of determining the image locations for objects placed in front of concave mirrors.
Physics Classroom
The Physics Classroom: Refraction and the Ray Model of Light: Anatomy of a Lens
Illustrated diagrams in this tutorial help students understand the properties and functions of lenses.
Zero Bio
Zero Bio: Cellular Respiration Game
Make sure you know your facts before playing this game! Concepts of cellular respiration are the focal point of the questions. Get them correct and hit the target, or get them wrong and your arrow will flop.
Exploratorium
Exploratorium: Water Sphere Lens
A discussion of how to make a magnifying lens exhibit using a water-filled flask and a light bulb. Consists of assembly instructions and a "To do and notice" section. Great for a teacher demonstration or a student project.
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