Bridgewater founder Ray Dalio is known for his innovative investment strategies. Dalio’s All Weather strategy, focused on performance through any market environment, is particularly compelling ...

The lenses have a coating to further prevent glare, and another to prevent smudging. The acetate frames have a nice heft to them—they're slightly heavier than Ray-Ban Wayfarers, but less chunky ...

\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.

There are even images shot with lenses originally designed for vintage cinema projectors, x-ray machines, aerial reconnaissance and military tanks.

The new 100-millimeter (3.9-inch) diameter lens, which has a 200 mm (7.8 in) focal length, is just 2.4 micrometers thick. Optimized for the 400 to 800 nm wavelength range for visible light, this ...