Mathematics and Society - OS X Lion Server

BENDING OF LIGHTk7[~(7?7CrIaNLight travels at different speeds through different materials.from air into water at an angle it changes direction, we say, it refracts.When light goesWith this activity you will find a number called the index of refraction that hasto do with the speed of light.Materials Needed:4 pins, ruler, compass, thick piece of glassStep A 1) Make line labout 10 cm long.2) Line p isperpendicular to line l.Ip,3) Angle i, the incident"1,,.angle, should be aboutI l,"'- "2 45°.,I,II, about 5 cm apart.I 4) Place pins III & 1/2 in line IIStep B~ the glassplate flat sothe top edgelies on l.4) Place pins #3 & #4so they lie in astraight line withpins #1 & #2 thatyou see through theglass edge.pi ,, .:-.\I 2) Trace along the bottom of the"1 glass plate and label it n., 3) Looking from the table sightpins #1 & #2 through the edgeof the glass plate. Move yourhead until they are in astraight line.Important: Be sure to look through the~b"'f"/=~========~ glass, not over the top.Step C 1) Remove the glass plate.2) With a straightedgedraw the line throughthe pins #3 & #4 upto line n.01I3) Connect the pointsof intersection onlines l & n.This shows how the light rayas it goes through the glass.refracts365