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Across 2. In reflection, the angle of _________ equals the angle of reflection. 4. In an x-ray, what colour is a break in the bone (black or white?) 5. ____ cancer can be caused by too much exposure to ultraviolet radiation. 6. A light source with only one colour. 10. Type of light used in security marking. 13. Does the strength of a gamma source increase or decrease with time? 14. Type of lens used to correct for long-sight. 15. Type of film used to detect x-rays. 17. A converging lens brings light to a point called a _____. 18. Type of lens used to correct for short-sight.

Down 1. Another name for heat radiation. 3. The name of an optical fibre used by doctors to examine inside the body. 7. Somebody who cannot see distant objects clearly is _____-_______. 8. What word describes chemicals glowing under ultraviolet light? 9. Which type of radiation would you use in an airport scanner? 11. A _________ shows up infrared radiation as different colours. 12. X-rays, gamma, ultraviolet and infrared radiation are all types of radiation which are _________ to the human eye. 16. Gamma radiation is used as a ______ in both medicine and industry.