Reflection and refraction are changes in the direction of a wave at an interface between two media. Reflection occurs when a wave returns to its original medium at the interface, with the angle of the reflected wave being equal to the angle of the incident wave. Refraction occurs when a wave bends as it passes from one medium to another where its speed changes, with the angle of refraction determined by Snell's law. Examples of reflection and refraction include the bending of light, sound, and water waves at boundaries between different materials or densities.

1. Reflection andReflection and
RefractionRefraction
Presented by
"The Wonka Nerds"
Group Five

2. 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.

3. original wave = incident ray
reflected wave = reflected ray
barrier = Reflecting surface
θi = angle of incident ray
θr = angle of reflected ray

5. 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.

6. θ
θ

8. (where n = index of refraction)

9. Index of Refraction
MATERIAL INDEX
Air 1.00029
Water at 20°C 1.33
Ice 1.31

10. SNELL'S LAW

12. 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/im
ages/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