4.3 Refraction and Lenses

1. Who is the author of the book Opticks ? (pg.110)

• Benjamin Franklin

• Albert Einsten

• Sir Isaac Newton

• Alfred E Neumann

Refraction can cause you to: (pg.111)

• see objects larger than they really are

• see something that may not actually be there.

• see things upside down.

• see things in a different color.

When light rays enter a new medium at an angle, the change in _______ causes the rays to bend. (pg. 111)

Review: A medium is the ________ through which a wave travels. (pg. 136) glossary

Some mediums cause light to ______ more than others. (pg. 112)

Light travels fastest in _______. (pg. 112)

_______ causes light to bend more than either air or water does. (pg. 112)

The index of refraction of a medium is a _____ of how much a light ray bends when it enters that medium. (pg. 112)

When white light from the sun shines through water droplets in the air, what could appear? (pg. 113)

Light travels faster in _____ air. (pg. 114)

• cold

• hot

• dry

• no