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Across 1. blocking the passage of light 6. visually perceived radiant energy 7. the range of light that humans can see 11. allowing light to pass through 12. the bouncing of light off a surface 14. the bending of light as it passes from one medium to another 16. a high point on a wave

Down 2. the entire range of light 3. a wave where vibrations move perpendicular to the path of the wave 4. distance from one crest to the next or one trough to the next 5. a clear object that separates white light into the colors of the spectrum 8. scattering the light that passes through 9. a spectrum of colors caused by droplets of water in the air 10. a low point on a wave 13. light that has a certain range of wavelengths 15. to let sound or light pass through