Wednesday, January 14, 2015 11:00 AM
This article is about how anti-reflection coating reduces reflections from eyeglass lenses. But before we go there let's ask a more fundamental question: Why does glass reflect in the first place, after all, isn't glass supposed to be transparent?
Tuesday, September 30, 2014 2:30 PM
Sunsets are red and so are tomatoes, yet these two reds are quite different. The word "red" by itself doesn't carry enough information to uniquely identify a particular sensation of color.
Tuesday, July 22, 2014 10:00 AM
Different wavelengths of light (electromagnetic waves) create different sensations of color. For example, objects that reflect wavelengths of light in the range of 620 to 750 nanometers (roughly 200 time smaller than the width of a human hair) appear red/orange to us.
Monday, June 16, 2014 1:00 PM
To see how polarized sunglasses work, it is convenient to think of light as a wave moving along a string. Just like a wave on a string, a light wave wiggles transversally to its direction of motion. And just like a wave on a string, the plane in which the string oscillates can have different orientations.
Wednesday, June 11, 2014 11:00 AM
To see how white balancing algorithms work in a computer (or digital camera) it's important to know what we mean by "white." First of all, "white" is relative. Something that looks white will look gray when compared to a brighter "white."
Wednesday, February 12, 2014 11:46 AM
The human eye and the camera in an artificial vision system both
function as image acquisition devices so they share important
Wednesday, December 18, 2013 10:40 AM
Strolling out of the theater after seeing the recent 3D movie, Gravity
, my friend wondered why she felt slightly dizzy every time she watched a show in 3D.
Wednesday, October 16, 2013 11:00 AM
Children waiting in line get on an amusement park ride dread the sign
that says "You Must Be This Tall to Ride." Particles of light (photons)
on their way to break a molecular bond run into a similar problem.
Tuesday, August 27, 2013 7:43 PM
During courses in lens design one sometimes hears that the human eye is a poor performer when it comes to image quality.
Wednesday, August 14, 2013 5:26 PM
An optician, a nurse, and a pharmacist are competing in a reality show. A coffee thermos is left floating just offshore from the beach and the first one to reach it gets a hot cup of coffee.