Summary of Reflection and Mirrors Concepts

Mirror Definitions

  • Mirror: Reflective surface that bounces light to produce an image.

  • Plane Mirrors: Flat surfaces that reflect light to create virtual images.

Law of Reflection

  • Definition: Angle of reflection equals angle of incidence.

  • Key Points:

    • Incident ray, reflected ray, and normal in the same plane.

    • Incident and reflected rays on opposite sides of the normal.

Types of Mirrors

  1. Plane Mirrors

    • Produce virtual images, upright, same size, laterally inverted.

    • Distance from object equals distance to image.

  2. Concave Mirrors

    • Function: Collect light, form enlarged images.

    • Real and virtual images depending on object distance from focal point.

  3. Convex Mirrors

    • Reflective surface bulges outward, virtual image behind the mirror.

    • Used for wider field of view but produces reduced, upright images.

Image Characteristics

  • Virtual Image: Light rays do not meet; appear behind mirrors or lenses, generally erect.

  • Real Image: Light rays actually converge; can be projected on a screen, usually inverted.

Ray Diagramming

  • Technique for visualizing light paths.

  • SALT Method for describing images:

    • S: Size (real vs. virtual)

    • A: Orientation (upright vs. inverted)

    • L: Location (where image is formed)

    • T: Type (image characteristics)

Concave Mirror Cases

  1. Object Beyond C: Real, inverted, reduced image.

  2. Object at C: Real, inverted, same size.

  3. Object Between C and F: Real, inverted, magnified.

  4. Object at F: No image formed.

  5. Object in Front of F: Virtual, upright, enlarged.

Uses of Mirrors

  • Convex: Vehicle side mirrors for safety, surveillance, funhouses.

  • Concave: Telescopes, shaving mirrors, lighting devices.

Quick Facts

  • One-way mirrors allow for visibility in one direction depending on lighting conditions.

  • Infinite images possible with two mirrors facing each other.