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.

• Refraction and Magnification

  • In general, two types of lenses exist: convex lenses, which cause parallel light rays to converge, and concave lenses, which cause parallel light rays to diverge.
  • The former property of convex lenses is of special interest to microbiologists.
  • In essence, a convex lens allows magnification.
  • A magnifying glass is one convex lens, and this by itself allows the magnification of objects.
  • Note also that many of the lenses are convex, thus the light that goes through a specimen is focused and therefore magnified.

• 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 Spine

  • Lordosis is an exaggerated convex (lordotic) curvature of the lumbar region; it is commonly known as "swayback."
  • The cervical curve convexes forward and begins at the apex of the odontoid (tooth-like) process, and it ends at the middle of the second thoracic vertebra.
  • The thoracic curve convexes dorsally, begins at the middle of the second thoracic vertebra, and ends at the middle of the 12th.
  • It is convex anteriorly, the convexity of the lower three vertebrae being much greater than that of the upper two.

• Properties of Indifference Curves

  • Almost all indifference curves will be negatively sloped, convex, and will not intersect.
  • Nearly all indifference lines will be convex, or curving inwards at the center (towards the bottom left).
  • Consumers naturally desire a bundle of goods that is varied (hence the convex curves for most comparisons) in order to maximize their utility.

• 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.