Light and Lenses F

What can light pass through?  Opaque  materials that completely block light from passing through ( a textbook)  Transparent  materials that allow light to pass through with almost no disturbance (a window)  These may or may not color the light but you can see objects clearly through them

 Translucent  materials that allow only part of the light to pass through, while also bouncing it in many new directions  they often give a blurry view and are used in shower doors to let in some light but also allow for privacy

Polarization  A way to control light  Light travels in waves; normally they vibrate in all directions however light can be polarized by some materials  This means only one direction of light vibrations pass through them  Examples: some sunglasses; self tinting glasses

 Reflected light is often naturally polarized to vibrate sideways  Polarizing glasses only allow in light that vibrates up and down and helps to block glare and other light that vibrates sideways

Refraction  The bending of light rays as they pass from one substance into another (page F98)

Convex and Concave Lenses  Convex  curves outward  Form images by refracting light rays together  The size and position of the image depend on how far away the object is from the lense

 Concave  curves inward  Form images by refracting rays apart  These images are always right-side up and smaller then the object