1.  Only transverse waves can be “sorted” using polarizers  Polarizers only allow waves vibrating in the direction of their openings to get through

2.  Reduction of glare  Concentrating radio signals  Chemistry, geology, navigation, etc.

3.  Your eyes see 3D because they are spaced apart  Each eye sees a slightly different image  Your brain interprets how the images go together  3D movies involve two slightly different views of the movie shown at once  Polarized 3D lenses allow each eye to only see one of the views  Your brain then puts together what the eyes are seeing

4.  Instead of using polarized lenses, a red and a cyan lens can be used to see a moving in 3D  The two different views of the movie that are shown simultaneously are colored red and cyan  Each lens filters out one of the views, so each eye only sees one of the views  Then your brain does the rest of the work.

5.  Curved mirror can change the size of an image  Concave mirrors make images smaller or larger  Convex mirrors make images smaller (security mirrors)

6.  Concave mirrors can produce images in front of the mirror  All of the light converges at points in front of the mirror causing the image to form there

7.  flexible, transparent fiber made of a pure glass not much thicker than a human hair  Light gets “trapped” inside of the fibers because of total internal reflection.  The light bounces off the sides of the fiber at angles larger than the critical angles causing it to stay inside the fiber