Science | 3rd Quarter Lesson 01

• Light is a form of energy which helps us to see objects.
• Types of Reflection:

  • Irregular
  • Regular
• Concave Mirror = Converging Mirror
• 1. do > c (object is beyond c)

  loc: di between c and f

  size: diminished

  orientation: inverted

  type: real
• 2. do = c (do is at c)

  loc: di = c

  size: same

  orientation: inverted

  type: real
• 3. do = between c and f (do is between c and f)

  loc: di beyond c

  size: magnified

  orientation: inverted

  type: real
• 4. do = f (do is at f)

  no image
• 5. do < f (do is between principal focus and mirror)

  loc: behind the mirror

  size: larger than the object

  orientation: erected

  type: virtual
• Curved / Spherical Mirror

  • A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex (bulging outward) or concave (bulging inward). Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices.
  • A curved mirror is a reflecting surface in which its surface is a section of sphere.
• Concave "Converging Mirror"

  • It is a curved mirror in which the reflective surface bulges away from the light source.
• C = center of curvature
• F = focal point / focus
• A = vertex
• R = radius of curvature
• Center of curvature - the point in the center of the sphere from which the mirror was sliced.
• Focal point / focus - the point between the vertex and the center of curvature.
• Vertex - the point on the mirror's surface where the principal axis meets the mirror.
• Principal axis - line passing through the center of the sphere and attaching to the mirror in the exact center of the mirror.
• Radius of the curvature - the distance from the vertex to the center of curvature.
• Focal length - the distance from the mirror to the focal point.
• F = focal length
• Convex Mirror

  • diverging mirror that bulges outward.
  • they reflect light away from the mirror, causing the image formed to be smaller than the object.
  • always behind the mirror.
• Convex Mirror

  do ) behind the mirror

  do: always behind the mirror

  di: between the mirror of the pole and the principal focus

  size: always smaller than object

  orientation: erected

  type: virtual