IN such elementary text-books on geometrical optics as I have consulted it has always seemed to me that the writers have found a difficulty in presenting a precise direct proof of the theorem that ...

The incandescent light bulb was one of the first early applications of electricity, and it’s hard to underestimate its importance. But before the electric light, people didn’t live in darkness — they ...

Explore the multifaceted concept of the prism, illustrating how it reflects the interplay between perception, light, and ...

There has been a surprise discovery of ‘significant’ refraction of gamma rays which opens the door to nuclear photonics and the use of high energetic light beams to investigate the atomic nucleus.

We show that by coiling up space using curled perforations, a two-dimensional acoustic metamaterial can be constructed to give a frequency dispersive spectrum of extreme constitutive parameters, ...

The blue flash is a rare atmospheric optical phenomenon observed at sunset, appearing just before the Sun's last rays disappear below an unobstructed horizon. This phenomenon occurs because Earth's ...

Harry Potter fans, do not despair! Invisibility cloaks may be a long shot, but last year physicists demonstrated technology that might someday hide you from radar. Now, two groups of researchers have ...

Refraction is an addicting puzzle game using lasers and prisms. Use mirrors and prisms to split or combine colored lasers, while interacting with various environmental objects. Refraction offers ...

Yutai's Dispersive Equilateral Prisms, which are fabricated from H-ZF13, F4,H-K9L or infrared material.These prisms create less stray light than diffraction gratings, thereby eliminating the higher ...