Law of Reflection 42715 Law of Reflection Law

Law of Reflection 4/27/15

Law of Reflection • Law of Reflection: The angle of incidence equals the angle of reflection • Incident Ray: the light ray that hits the surface • Reflected Ray – the light ray that bounces off the surface • Angle of Incidence: the angle between the incident ray and the line perpendicular • Angle of Reflection: the angle between the reflected ray and the line perpendicular

Law of Reflection

Law of Reflection Mathematically: θ=ϕ Where, θ = Angle of Incidence ϕ = Angle of Reflection

Mirror Maze Assignment

Law of Reflection • Law of reflection labels: - “Mirror” [solid line with hash marks “⁄ ⁄ ⁄”] - “Perpendicular (normal) line” [dashed] - Angle of incidence in degrees “θ = x°” - Angle of reflection in degrees “ϕ = y°” - Incident ray and reflective ray indicated by a solid line with arrows (rays can cross) • NOTE: Line perpendicular, incident ray and reflected ray have to form a point (vertex)

Assignment: Design a “mirror maze” that uses at least ten plane mirrors. You can add a creative theme or design. 1) Draw the incident ray (rays can intersect) 2) Draw the mirror line with hashes 3) Draw the line perpendicular (90°) 4) Measure the angle of incidence (θ) and include on drawing 5) Measure the angle of reflection (ϕ) and include on drawing 6) Draw the reflective ray 7) Repeat until you have a least ten

Law of Reflection (recap) • Line perpendicular (normal line) is 90° from the surface (mirror) • Angle of incidence = θ • Angle of reflection = ϕ • “Mathwise”: θ = ϕ • Line perpendicular, incident ray and reflected ray have to form a point (vertex)