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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.

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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.

However, as filament temperature increases in a tungsten-halogen lamp, the light emission profile shifts to shorter wavelengths so that as temperature ...

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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.

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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.

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.

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.

A light meter (or illuminometer) is a device used to measure the amount of light. In photography, an exposure meter is a light meter coupled to either a ...