"5-3 Wave Interactions": HTML5 Crossword

Across

3. the passage of an EM wave through a medium (13)
4. spreading out of light rays in all directions, because particles reflect and absorb the light (11)
10. the meeting and combining of waves (13)
11. preventing the passage of light (7)
13. meeting of waves in which the combined wave is smaller than the original waves (12,12)
14. a change in the observed frequency of a wave due to relative motion between the source and the observer (8,6)
15. the bouncing back of a wave after it strikes a barrier (11)

Down

1. allowing all or most of light to pass through easily (12)
2. meeting of waves in which the combined wave is larger than the original waves (13,12)
3. an image that forms at a location from which light rays appear to come but do not actually come (8,5)
5. the disappearance of an EM wave into the medium (11)
6. permitting some light to pass through but giving an unclear image (12)
7. a quality of light in which all of its waves vibrate in the same direction (13)
8. a tool that uses refraction to spread out the different wavelengths that make up white light (6)
9. the bending of a wave as it enters a new medium (11)
12. an image that is formed by the intersection of light rays; a real image can be projected on a screen (5,5)
14. the spreading out of waves through an opening or around a corner (12)