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The Letter A

The Letter B

The Letter C

The Letter D

The Letter E

The Letter F

The Letter G

The Letter H

The Letter I

The Letter J

The Letter K

The Letter L

The Letter M

The Letter N

The Letter O

The Letter P

The Letter Q

The Letter R

The Letter S

The Letter T

The Letter U

The Letter V

The Letter W

The Letter X

The Letter Y

The Letter Z
Annotated Work Cited Physics Videos

The Letter R:

Radiation- Waves that carry energy (Dangerous to humans)


Refraction- change in direction of light ray when passing one medium to another.