Reflection and Reflection and RefractionRefraction

Presented by "The Wonka Nerds"

Group Five

REFLECTIONREFLECTION• is the change in direction of

a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.

• Common examples include the reflection of light (mirror, etc.), sound (echoes, etc.)  and water waves.

original wave = incident ray

reflected wave = reflected ray

barrier = Reflecting surface

θi = angle of incident ray

θr = angle of reflected ray

REFRACTION• is the bending of a wave when it enters a

medium where its speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media.

θ

θ

(where n = index of refraction)

Index of Refraction

MATERIAL INDEX

Air 1.00029

Water at 20°C 1.33

Ice 1.31

SNELL'S LAW

SOURCES:

• http://www.ducksters.com/science/physics/wave_reflection.gif• http://www.aplusphysics.com/courses/regents/waves/images/law-of-

reflection.gif• http://micro.magnet.fsu.edu/optics/lightandcolor/images/reflectionfigure1.jpg• http://www.one-school.net/Malaysia/UniversityandCollege/SPM/

revisioncard/physics/light/images/refraction.png• http://www.ducksters.com/science/physics/wave_refraction.gif• https://s-media-cache-ak0.pinimg.com/236x/b9/59/d5/

b959d5a9ab43af16ba241a1663acdedf.jpg• http://www.capphysics.ca/PhysLab/Phys104/Optics%20reflection

%20refraction/Images/SnellsLaw.gif• http://2.bp.blogspot.com/-7vwY4w4AefE/UXVVH6S0HWI/

AAAAAAAAAMo/OqTbUS-PLgk/s1600/photo.JPG• http://classes.colgate.edu/rapril/geol201/images/snell.gif