Light travels at different speeds based on the medium it passes through. For example, in a vacuum, it travels at 3.0 × 10^8 m/s in a straight line. But when directed towards glass, air, diamond, water ...

Shini talks to us about optical instruments and how they make magnification possible. How do lenses work? How do they form images? Well, in order to understand how optics work, we have to understand ...

For the first time, a flat telescope lens has been produced that represents colors accurately, offering a way to make less ...

Night falls on the telescope dome at the Yerkes Observatory in Wisconsin. Its 40-inch telescope is visible inside. This is the largest refracting telescope in the world. * Photo: Roger ...

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