Extravidros

25/11/2024

DE SEGUNDA A SÁBADO ESTAMOS FUNCIONANDO.
AVENIDA VASCO DA GAMA, 693
71-982423732 / 3052-2457

18/11/2024

Toquinho, Tom Jobim, Vinícius de Moraes e Chico Buarque...

Boa Noite.

04/11/2024

TRABALHAMOS A TODO V***R DE SEGUNDA A SÁBADO.
SEGUNDA A SEXTA DAS 7:30 ÀS 17:00
SÁBADOS 8:00 AS 12:00

04/11/2024

04/11/2024

02/11/2024

Daniele Faccio of the University of Glasgow, UK, and his colleagues say they are shocked that this type of light scattering has not been noticed before. It works in the same way as clouds, snow and other white materials that absorb light: once photons hit the surface of such a material, they are scattered in all directions, barely penetrating and being reflected back the way they came. For example, when sunlight hits a tall cumulonimbus cloud, it bounces off the top, making that part of the cloud appear bright white. But so little light reaches the bottom of the cloud that that part appears grey — despite being made up of the same water droplets. Read more: https://www.newscientist.com/.../2454183-cloud-inspired.../ Image: University of Glasgow Daniele Faccio of the University of Glasgow, UK, and colleagues say they are shocked that this type of light scattering has not been noticed before. Light does not travel in straight lines, but it can bend in certain situations: Gravity bends light, due to the deformation that masses such as stars and planets cause in space-time. This is called the gravitational deflection of light. When light passes from one medium to another, it undergoes refraction, which can cause it to bend and bend. For example, when light passes from air to water, it undergoes refraction, making spoons appear broken. Scientists can make light bend in complex ways by using artificial materials, or metamaterials, to guide the light waves.

Scientists have discovered a technique whereby light can be bent around corners, inspired by the way clouds scatter sunlight. This type of light-bending could lead to advances in medical imaging, electronics cooling and even nuclear reactor design.

Daniele Faccio at the University of Glasgow, UK, and his colleagues say they are shocked this type of light scattering wasn’t noticed before. It works on the same basis as clouds, snow and other white materials that absorb light: once photons hit the surface of such a material, they are scattered in all directions, barely penetrating at all and getting reflected out the way they came. For instance, when sunlight hits a tall cumulonimbus cloud, it bounces off the top, making this part of the cloud appear bright white. But so little light reaches the bottom of the cloud that this part appears grey – despite being made up of the same water droplets.

Read more: https://www.newscientist.com/article/2454183-cloud-inspired-material-can-bend-light-around-corners/

Image: University of Glasgow

01/11/2024

ACNUR, Agência da ONU para Refugiados

01/11/2024

01/11/2024