Bellwork (4/29) What is light scattering? The deflection of a light ray from a straight path

Light Scattering Why is the sky blue and sunset red?

Rayleigh Scattering Polarizes the sky!

Law of Reflection 4/29/14

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

Bellwork (4/30) What is the Law of Reflection? The angle of incidence equals the angle of reflection

Calendar Today (4/30): Law of Refection Assignment Tomorrow (5/1): Refraction notes Friday (5/2): Reflection Practicum Monday (5/5): Pre-Lab Tues. (5/6): Lab Sometime: Pop Quiz

Law of Reflection 4/30/14

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

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: (due Fri 5/2/14) 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