1. Light and Color

2. Transparent
Translucent
Opaque
allows light to pass through with little interference
ex. air, glass, water
transmits light but does not transmit an image
ex. wax paper
transmits no light
ex. metal, wood

4. Colors of Objects
Mixing Colors of Light
colors you see are determined by the wavelengths of light that reach your eye
opaque objects reflect certain colors and absorb all others
combine red, green, and blue (primary light colors) to make white light
other combos make different shades

5. Mixing Colors of Pigment
material that gives a substance its color
absorbs some colors and reflects others
ex. chlorophyll (plants = green), melanin (your skin color)
primary pigments = yellow, cyan, and magenta

8. Mirrors and Lenses Plane Mirror Image Virtual Image
mirror with a flat surface
copy of an object formed by reflected or refracted rays
upright; same size as object
left and right are reversed
appears to be behind the mirror

10. Concave Mirror
Real Image
Optical Axis
surface that curves inward (like a bowl)
reflects parallel rays so they meet at a point
forms virtual or real image
when rays actually meet upside down
can be projected onto a screen
imaginary line that divides a mirror in half

11. Focal Point
point where rays parallel to opt. axis meet
depends on shape of mirror
type of image depends on location of object
virtual or real images
if object is farther from mirror than focal point, forms a real image
if object is between mirror and focal, forms virtual image (always larger than object)

12. How Images Are Formed in Concave Mirrors

13. Convex Mirror
surface that curves outward
focal point is point from which rays appear to come
images are always virtual and smaller than object
ex. car mirror: “Objects in mirror are closer than they appear”

14. Convex Mirror Ray Diagram

15. Lens
Convex Lens
curved piece of glass used to refract light
diff shapes
image depends on shape
thicker in center than edges
more curved = more it refracts
object’s position determines what it forms (virtual or real)

17. Concave Lens
thinner in center than edges
produces only virtual images
always upright and smaller than object