The green flash is a rare, brief optical event of green, yellow, and sometimes blue that colors the horizon, occurring at sunrise or sunset most often in the western U.S. Refraction and dispersion ...

Rainbows, a spectacle of vibrant colours painted across the sky, are often seen as semicircles due to the horizon obstructing our view. However, these mesmerizing arcs are actually full circles formed ...

Ultrafast extreme ultraviolet (XUV) spectroscopy is a powerful technique for probing the dynamics of atoms and molecules with attosecond time resolution. However, conventional XUV absorption ...

When evaluating a patient who is unhappy with his or her cataract surgery yet has good Snellen visual acuity, we should approach the patient like one who is unhappy with a new pair of glasses.