Unit 9 – Waves & Optics. Chapters 14-16. Electromagnetic waves is a transverse wave consisting of oscillating electric and magnetic fields at right angles to each other. 14-1 Characteristics of Light. The EM spectrum includes more than visible light.
c = speed of light in a vacuum (3.0 x 108 m/s)
l = wavelength (meters)
f = frequency (Hertz)
Reflection – 14.2 & 14.3
Flat Mirrors & Curved Mirrors
Light reflected from a rough, textured surface is called diffuse reflection.
Light reflected from a smooth, shiny surface is called specular reflection.
Angle of reflection – angle formed by the line normal to a surface and the direction in which a reflected ray moves.
These angles are measured from the normal.
Refraction – 15.1
Refraction - light BENDS when it goes from one kind of substance to another (because of the change in average speed).
THE FREQUENCY DOES NOT CHANGE!
Using v = f, we see
that the wavelength has
Example: If light travels at 1.94 x 108 m/s through salt, what is the index of refraction?
Lenses – 15.2
Like mirrors, lenses form images, but lenses do so by refraction rather than reflection.
The two basic types of lenses are::
predict what kind of images each type of