| 11. | The sensors are also known as passive infrared light sensors or PIR sensors.
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| 12. | Protostars are spectacular, glowing with dull red light and infrared light.
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| 13. | Signals pass between the dial pad and headset using infrared light.
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| 14. | But in infrared light, a glowing ring of light shines through the dust.
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| 15. | The infrared light even allows the camera to look through those dark-tinted windows.
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| 16. | The infrared light pulses form a pattern unique to that button.
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| 17. | The dust blocks infrared light much less strongly than it does visible light.
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| 18. | An infrared light source on your PC bounces infrared beams off the mouse.
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| 19. | The wavelength of infrared light ranges from 0.75 to 300 micrometers.
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| 20. | The warm planet peaks in infrared light, so is shown brighter.
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