The formation of a rainbow requires the observer to be between the sun and falling rain, with the rain in front and the sun behind. Sunlight passes from behind the observer, refracts as it enters each ...

Optical dispersion occurs when the refractive index of a material changes with the wavelength of incoming light. This variation causes different colors to move at different speeds in transparent media ...

Air Marshal Dilip Kumar Patnaik (Retd) recalled an incident 14-15 years ago where a missile was fired at what was later identified as an illusion. Patnaik firmly ruled out the possibility of UFOs, ...

Diffraction refers to the bending of waves, such as light, when they encounter obstacles or pass through small openings. The size of the opening relative to the wavelength of light influences the ...

As a new kind of elastic materials, elastic wave metasurface has great research significance in the field of elastic wave regulation. However, most of the researches on elastic wave metasurface are ...

What color is the coronavirus? Conventional optical microscopes are unable to generate high-resolution, colored images of viruses and bacteria. Expensive equipment is used to view them in a more real ...

The sky is in charge of giving us the greatest phenomena. In the dark of the night, we can observe in its vault the movements of the stars and the brilliant meteor showers. But, during the day, visual ...

The various kinds of DOEs use microstructured surface profiles for their optical functionality. By proper optical design a DOE can reshape light to practically any distribution, basically by ...

Royalty-free licenses let you pay once to use copyrighted images and video clips in personal and commercial projects on an ongoing basis without requiring additional payments each time you use that ...