1. Types & Laws of Reflection
Light – Reflection
Types & Laws of Reflection

2. Light: Light travels in a straight line until it strikes an object
If the object is:
Opaque then transmission is interrupted (i.e. piece of wood)
Transparent then transmission passes through it (i.e. window)
Reflective then transmission is reflected

3. Recall,
When a reflection occurs “head on”, orientation of the image is not preserved, yet projection lines are parallel.
Ex.

4. Types of Reflection: Specular Reflection: Diffuse Reflection:
Beam of light reflected “perfectly” (in parallel to each other) from a shiny, polished surface
Ex. mirrors, stainless steel, glass
Diffuse Reflection:
Beam of light reflected “irregularly” (in different directions) from an irregular surface
Ex. Sheet of paper, table top

5. Laws of Reflection – Plane Mirror:
normal
incident ray
reflected ray
angle of reflection
angle of incidence
point of incidence
The angle of incidence is equal to the angle of reflection
The incident ray, the reflected ray & the normal all lie in the same plane.

6. Curved Mirrors:
A curved mirror may be thought of as a section of a hollow sphere
The inside of the sphere results in a concave mirror
also called a converging mirror
The outside results is a convex mirror
also called a diverging mirror

7. Laws of Reflection – Curved Mirrors:
Use only if not given any other information!!!
We will complete questions later where more info is given & can solve more quickly & accurately!!!
Same as plane mirrors, but must construct the normal using the tangent to the curve of the mirror at the incidence point
point of incidence
tangent
normal

8. Try:
Worksheet