Physics 1051 Lecture 6/7 Slide 1

Refraction of Light

Physics 1051 Lecture 6/7 Slide 2

Wave Boundary Behavior

• wave speed and wavelength are greater in less dense medium

• wave frequency is not altered by crossing boundary

• reflected pulse is inverted when wave travels from less dense medium to more dense medium

• incident pulse amplitude is greater than reflected pulse amplitude

Physics 1051 Lecture 6/7 Slide 3

Refraction of Light Beam

• Refraction -- bending of light wave path as light passes from one material to another material.

• Refraction occurs at the boundary and is caused by a change in the speed of the light wave upon crossing the boundary.

• Direction of bending depends upon whether light wave speeds up or slows down at the boundary.

Physics 1051 Lecture 6/7 Slide 4

Transmission Across a Boundary

• Wave speed & wavelength change

• When the wave approach is perpendicular to the boundary, its speed changes, but there is no bending of the path

Physics 1051 Lecture 6/7 Slide 5

Refraction of Water Waves

Physics 1051 Lecture 6/7 Slide 6

Refraction Applets

• Applet by National High Magnetic Field Laboratory, Florida State University

• Applet by Fu-Kwung Hwang, National Taiwan Normal University

Physics 1051 Lecture 6/7 Slide 7

Ray Diagram

Physics 1051 Lecture 6/7 Slide 8

Physics 1051 Lecture 6/7 Slide 9

Optical Density

•

Physics 1051 Lecture 6/7 Slide 10

Index of Refraction

• Index of Refraction

• Represented by n

Physics 1051 Lecture 6/7 Slide 11

Indices of Refraction

Physics 1051 Lecture 6/7 Slide 12

Law of RefractionSnell’s Law

Physics 1051 Lecture 6/7 Slide 13

FST & SFA

Physics 1051 Lecture 6/7 Slide 14

Apparent Depth

Physics 1051 Lecture 6/7 Slide 15

Spear-Fishing

Physics 1051 Lecture 6/7 Slide 16

Delayed Sunset

Physics 1051 Lecture 6/7 Slide 17

Broken Pencil

Physics 1051 Lecture 6/7 Slide 18

Palm Tree Mirage