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Light can be polarised by passing it through a polarising filter. A polarising filter has all its molecules aligned in the same direction. As a result, only waves with vibration aligned in the same direction can pass through.

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Upon striking the sample, photons that match the energy gap of the molecules present (green light in this example) are absorbed, exciting the molecules.

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Some animals can see in polarised light, including the fiddler crabs and mantis shrimp in David Attenborough's Life in Colour.

Infrared radiation (IR), sometimes referred to simply as infrared, is a region of the electromagnetic radiation spectrum where wavelengths range from about 700 nanometers (nm) to 1 millimeter (mm).

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Infrared uses

But 'up' and 'down' are not fixed directions. The vibrations could be vertical, horizontal, or at any angle in between. In fact, the waves that make up sunlight, for example, are evenly distributed across all angles.

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Some of these types of light are diffused, backlit and reflected. There will be times when each of these types of light is more readily available than another.

Infrared waves

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Infrared is commonly separated into near-, mid- and far-infrared. It can also divide into the following five categories:

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Infrared light is invisible to the human eye, but heat sensors can detect longer infrared waves. Infrared shares some characteristics with visible light, however. Like visible light, infrared light can be focused, reflected and polarized.

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Infrared has a variety of uses and applications. Some common uses for IR include heat sensors, thermal imaging and night vision equipment.

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Infraredwavelengthrange in m

Infrared frequency

In networking, wired and wireless operations use infrared light. Remote controls use near-infrared light, transmitted with LEDs, to send focused signals to home-entertainment devices, such as televisions. Fiber optic cables also use infrared light to transmit data.

In addition, astronomers extensively use infrared to observe objects in space that the human eye can't detect, such as molecular clouds, stars, planets and active galaxies.

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Infrared energy

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Infrared is typically subdivided into multiple spectral regions, or bands, based on wavelength. However, there is no uniform definition of each band's exact boundaries.

Infraredlight

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Light is also partially polarised when it bounces off a shiny surface. For example, the light that reflects off a horizontal surface, such as a puddle, is mostly horizontally polarised. Polarised sunglasses are usually vertically polarised to reduce the glare from puddles or wet roads.

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Imagine holding a skipping rope so that it passes between the posts of a picket fence, and waving it up and down. The vertically aligned waves will be able to pass between the gap in the fence posts. But if you wave it from side to side, the waves will be blocked.

Light is a transverse wave: the wave is S-shaped, with the curves of the S at right angles to the direction it travels. Essentially, the wave vibrates up and down as it travels forwards.

British astronomer Sir William Herschel discovered infrared in 1800. Herschel knew sunlight could separate into components, which occurs when light refracts through a glass prism. He then measured the temperatures of the different colors created.

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Near-infraredwavelength

Ir light wavelengthin nm

Infrared waves are longer than visible light waves but shorter than radio waves. Correspondingly, the frequencies of IR are higher than microwave frequencies but lower than visible light frequencies, ranging from about 300 gigahertz to 400 terahertz (THz).

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Since only a small selection of the waves can pass through a polarising filter, the overall intensity of the light is reduced. This is why sunglasses can be polarised: to reduce brightness and glare without compromising your vision.

Herschel found the temperature increased as the colors progressed from violet all the way to red light. Herschel then went a step further and measured the temperature in the portion beyond the red area. There, in the infrared area, he found the temperature was the highest of all.

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