convex

Examples of convex in the following topics:

• Image Formation by Spherical Mirrors: Reflection and Sign Conventions

  • Spherical mirrors can be either concave or convex.
  • A convex mirror has a negative focal length because of this.
  • A summary of the properties of convex mirrors is shown below:
  • A convex mirror with three rays drawn to locate the image.
  • For a convex mirror, the image is virtual and upright.

• The Compound Microscope

  • A compound microscope is made of two convex lenses; the first, the ocular lens, is close to the eye, and the second is the objective lens.
  • It is made of two convex lenses: the first, the ocular lens, is close to the eye; the second is the objective lens.
  • shows a diagram of a compound microscope made from two convex lenses.

• The Magnifying Glass

  • A magnifying glass is a convex lens that lets the observer see a larger image of the object being observed.
  • Since a magnifying glass uses its convex shape to focus light in a certain position, it can be used to converge the sun's radiation at the focus, causing hot spots.
  • A magnifying glass is a convex lens that lets the observer see a larger image of the object under observation.
  • A magnifying glass is a convex lens that lets the observer see a larger image of the object under observation.

• The Lensmaker's Equation

  • A lens is biconvex (or double convex, or just convex) if both surfaces are convex.
  • The signs of the lens' radii of curvature indicate whether the corresponding surfaces are convex or concave.
  • The sign convention used to represent this varies, but for our treatment if R1 is positive the first surface is convex, and if R1 is negative the surface is concave.
  • The signs are reversed for the back surface of the lens: if R2 is positive the surface is concave, and if R2 is negative the surface is convex.

• Refraction Through Lenses

  • The word lens derives from the Latin word for lentil bean—the shape of which is similar to that of the convex lens (as shown in ).
  • The convex lens is shaped so that all light rays that enter it parallel to its axis cross one another at a single point on the opposite side of the lens.
  • Such a lens is called a converging (or convex) lens for the corresponding effect it has on light rays.
  • Compare the effect of a convex lens and a concave lens on the light rays

• Newton's Rings

  • Newton's rings seen in two plano-convex lenses with their flat surfaces in contact.
  • One surface is slightly convex, creating the rings.

• Combinations of Lenses

  • Note the sign convention: a telescope with two convex lenses (f1 > 0, f2 > 0) produces a negative magnification, indicating an inverted image.
  • A convex plus a concave lens (f1 > 0 >f2) produces a positive magnification and the image is upright.
  • The most common type of achromat is the achromatic doublet, which is composed of two individual lenses made from glasses with different amounts of dispersion Typically, one element is a negative (concave) element made out of flint, which has relatively high dispersion, and the other is a positive (convex) element made of crown glass, which has lower dispersion.

• Thin Lenses and Ray Tracing

  • Shows how to draw the ray diagrams for locating the image produced by a concave lens and a convex mirror.

• The Thin Lens Equation and Magnification

  • Shows how to use the thin lens equation to calculate the image distance, image height and image orientation for convex lenses when the object distance is greater the the focal length (f).

• Nearsightedness, Farsidedness, and Vision Correction

  • The image passes through several layers of the eye, but this happens in a way very similar to that of a convex lens.