1. Chapter 17
Reflection
Homework: Read Section 1, pp.
Reflection:
The rebounding of light waves when they
are incident at the boundary of two media.
Reflection may be “regular” or “diffuse”.
Regular
Diffuse

2. Mirrors:
Usually a layer of glass coated with a thin layer
of silver and a layer of opaque paint.
To produce images, they must be very smooth
(regular reflection) and have a high reflectance.
Reflectance:
The percentage of light reflected by a surface. A typical mirror reflects ~ 70-75% of the incident light. Optical mirrors (used in telescopes) reflect about 95% of the incident light.
Types of Mirrors:
Plane, Concave, and Convex

3. Plane Mirror Geometry: