Can you see shadows with night vision

These materials play key roles in the concepts of modern "cloaking devices" where the idea there is to mask an object in a cocoon of meta material well into the visible spectrum. If you get into the metamaterial realm, the idea might be that one could not only bend the light around the object, but amplify the light in some way so that in some arbitrary direction light passing through the metamaterial exits with greater intensity than the background ambient light such that an object in the path of the amplified light would cast a shadow.

I would imagine that the impression of the observer would be that some region they are looking at somehow appear brighter, although the exact location of the light source might not be identified exactly. So in general it is possible to mask the specific location of a source, but you simply shouldn't be able to generate a shadow without there being some change in intensity between the front and back of the object casting the shadow. Think of shadow as absence of light.

So if you can a source of light and an object that is obstructing the path of the light,then a shadow is created. The length and shape of the shadow depends on the angle from which light was sourced. The source of light could be an infrared light. IR light is invisible to human eye. Yes, it casts a shadow which is only visible using a device which detects infrared light, like your phones camera. Your eyes cannot see invisible light, but, invisible light e. Now then, how could we use an invisible light source let's stick with IR and create a shadow that is visible to the human eye.

Here are a couple of possibilities:. You might also have to coat the back of the obstruction with a reflective coating of some kind to increase the reflected light level that would fall in the shadow region to make it look more realistic--otherwise, the shadow might appear too dark for the setup.

This possibility is of course not a real shadow--it's more of a pseudo shadow, if you will. This of course would create a visible light source from invisible radiant energy--which may not meet your criteria, however it would be sourced initially from an invisible light source. This is similar to 1, but using higher energy invisible wavelengths. Sign up to join this community. The best answers are voted up and rise to the top.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Additionally, cats have a reflective tissue behind their retinas.

Owls are much smaller than humans, but our eyes are nearly the same size. The results are great—if you put an owl on a soccer field lit by a single candle, with no other illumination from the moon or stars, the owl would probably be able to see a mouse anywhere on the field. In order to see from side to side, the owl has to turn its head. To compensate, owls can turn their heads almost completely around, granting them a wide vision field. The tarsier is a tiny primate in Southeast Asia.

The little animals are only about four inches long, excluding their tails. However, their eyes are about half an inch wide, which means their eyes take up nearly their entire head. Tarsiers have the biggest eye-to-body-size ratio known in the animal kingdom. Tarsiers are nocturnal predators, looking for insects and small lizards or birds when there is little to no light available. They have to be able to spot and stalk prey in the treetops, jumping from branch to branch in the dark, and their prey is tiny and often camouflaged.

Other animals can see well in the dark in different ways. Browse All Microsoft Office Articles What Is svchost. Browse All Privacy and Security Articles Browse All Linux Articles Browse All Buying Guides.

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