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  • Geometry of a Circle V1

    • Image
    • Text Document
    • PDF
    • 2.5D Tactile Graphic
    Multiple Diagrams illustrating four basic concepts of a circle. Terms include: circumference (distance around the whole circle), radius (distance from the center of the circle to the outer edge, diameter (the distance from the opposite point of the circle), and chord (the distance from any two points on the circle's edge).

    Diagram showing the geometry and terms used to describe a circle. Design modalities for the image include braille with and without labels, print with and without labels in greyscale, color, and texture.

    (Source: Benetech)

  • Geometry of a Circle V2

    • Image
    • Text Document
    • PDF
    • 2.5D Tactile Graphic
    Single Diagram illustrating four basic concepts of a circle. Terms include: circumference (distance around the whole circle), radius (distance from the center of the circle to the outer edge, diameter (the distance from the opposite point of the circle), and chord (the distance from any two points on the circle's edge).

    Diagram showing the geometry and terms used to describe a circle. Design modalities for the image include braille with and without labels, print with and without labels in greyscale, color, and texture.

    (Source: Benetech)

  • The event horizon of a black hole. Caption: The black hole has a radius, called the event horizon,

    Joe Pesce, a National Science Foundation astrophysicist, answers questions about black holes. Part of the "Ask a Scientist" series.

    (Source: DCMP)

  • Slightly concave rectangular surface with particles coming in at a straight angle and bouncing off on a different trajectory. Caption: The resulting image distortion is called spherical aberration.

    What does a mirror tell us about light? Illustrates 11 computer-animated video units for one aspect of light's behavior-reflection. Euclid's geometric optics and his findings on the perception of distance and perspective lead to a discussion of the Law of Reflection, linking angle of incidence with angle of reflection, and the concepts of absorption, transmission, and diffuse reflection. Explains the principles involved with plane, concave, and convex mirrors, including vertex, principle axis, center of curvature, radius of curvature, and virtual image. Shows a group of "mirror equations" how an object's location can be determined by using the laws of reflection.

    (Source: DCMP)