Breaking News                 Latest News            Usa News                 Diet News

Negotiating Tips to Get the Best Car Lease
Brian KlutchThrough The Looking GlassUnderstanding how light travels is the key.Why do the black and white bars on this piece of patterned paper seemingly switch direction? The answer lies in the shape of the glass—and what’s inside.First, a few basics...

What is causing these black and white bars to change direction?

Brian KlutchThrough The Looking GlassUnderstanding how light travels is the key.Why do the black and white bars on this piece of patterned paper seemingly switch direction? The answer lies in the shape of the glass—and what’s inside.First, a few basics...

What is causing these black and white bars to change direction?

Brian Klutch

Through The Looking Glass

Understanding how light travels is the key.

Why do the black and white bars on this piece of patterned paper seemingly switch direction? The answer lies in the shape of the glass—and what’s inside.

First, a few basics about how you perceive the world. Typically, light bounces off an ­object and hits your eye in a straight line. But when light waves have to travel through a ­medium thicker than air, they move more slowly. In this case, the water inside the glass has pumped the waves’ brakes.

That change in speed causes a ­redirection, or bend, of the wave, a process known in physics as refraction. You might remember this concept from high school science classes. Well that’s only half the story. Think of the glass as a converging lens, which is one that is curved on all sides. As light passes through it, the curved shape forces the light to bend from every direction. The dense medium of water significantly enhances this bending. The ­refracting light waves converge at what’s called the focal point, then cross each other.

This point lies somewhere between your eyes and the glass. The image you see is the one created by the crossed ­light waves. ­Because they now travel in opposite ­directions, the lines appear reversed. ­Ignore ­physics, and the image seems illusive; ­remember it, and it’s just reality.

This article was originally published in the March/April 2017 issue of Popular Science.

Our editors found this article on this site using Google and regenerated it for our readers.

Breaking News Headlines

Some Common Gambling Superstitions
Some Common Gambling Superstitions
Video Editing for Beginners: Things You Need to Get Started
  Video Editing for Beginners: Things You Need to Get Started
Choosing the Best Retail Franchise
Choosing the Best Retail Franchise
Benefits of Mobile Technology for Business Improvement
Benefits of Mobile Technology for Business Improvement
Promoting calls to Ryanair at a meeting following the decision to charge for climbing on board hand luggage
Promoting calls to Ryanair at a meeting following the decision to charge for climbing on board hand luggage
Macri, forced to ask for more money to the IMF to ward off the growing specter of the default
Macri, forced to ask for more money to the IMF to ward off the growing specter of the default
Utilize your online trading resources
Utilize your online trading resources
Sampdoria, Giampaolo ready to get back in the fieldx3a; quot;Right to just stop, debut egrave; joyquot;
Sampdoria, Giampaolo ready to get back in the fieldx3a; quot;Right to just stop, debut egrave; joyquot;
Napoli-Milan 3-2, Ancelotti still in recovery limelight Gattuso from 0-2 to 3-2
Napoli-Milan 3-2, Ancelotti still in recovery limelight Gattuso from 0-2 to 3-2
Juventus-Lazio 2-0: Ronaldo doesn't score but we think Totti and the French powerhouse
Juventus-Lazio 2-0: Ronaldo doesn't score but we think Totti and the French powerhouse
This is the ambitious plan of Norway to have the first fleet of aircraft electrical of the world
This is the ambitious plan of Norway to have the first fleet of aircraft electrical of the world
The dome of Ryanair has already lost 34 million of his bonus due to the impact of the strikes of this summer
The dome of Ryanair has already lost 34 million of his bonus due to the impact of the strikes of this summer
Pages
NEWS ARCHIVES