Optics Can you believe what you see?

Optics Reflection: Light is retransmitted from or “bounces off” an object

Optics Law of Reflection: The angle of incidence equals the angle of reflection.

Optics Refraction Light “bends” or changes its angle as it moves from one medium to another.

Optics Images What you “see” when you look into a mirror or through a lens.

Optics Real Image A real image can be projected onto a surface. Virtual Image A virtual image cannot be projected onto a surface.

Optics Mirrors Plane Mirrors Flat mirrors Always produce an image that is behind the mirror.

Optics Mirrors Spherical Mirrors Concave mirror Formed on the inside of a sphere Convex mirror Formed on the outside of a sphere

Spherical Mirrors

Optics Basic Terminology Focal Point The point where parallel beams of light converge after reflecting Center of curvature The center point of the circle made by a concave or convex mirror.

Optics Lenses Converging Lens Parallel beams of light come together after refracting through the lens Example: Magnifying Glass

Optics Lenses Diverging Lens Parallel beams of light spread apart after refracting through the lens Example: Certain eye glasses

Optics Ray Diagrams Let us predict where an image will form A light ray is drawn as a simple line with an arrow indicating the direction

Optics Concave mirrors—principle rays Incident ray parallel to axis, reflected ray through the focal point

Optics Concave mirrors—principle rays Incident ray through the focal point, reflected parallel to axis

Optics Concave mirrors—principle rays Incident ray through the center point, reflected through the center point

Optics Concave mirrors—examples Image is smaller, inverted and real

Optics Convex mirrors—principle rays Incident ray parallel to the axis, reflected away from focal point (virtual) (virtual ray)

Optics Convex mirrors—principle rays Incident ray toward the focal point, reflected parallel to the axis

Optics Convex mirrors—principle rays Incident ray toward the center point, reflected toward away from the center point

Optics Convex mirrors—examples Image: smaller, upright, virtual

Optics Converging Lens

Optics Converging Lens

Optics Converging Lens

Optics Converging Lens