Daily life we see so many objects .Often in textbooks the ray diagram for the image formation in eye is shown by showing light rays coming from the object and making an image in inner layer of eye . Do all objects and surroundings emit light so as we can be able to see those things when they make an image inside the eye ? If this is not true then what is the exact reason we see most objects at day , is tubelight in home / sun outside a reason for this ?
Optics – Do All Objects We See Emit Light Forming an Image Inside Our Eye?
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Related Solutions
After reflection the rays seem to be coming in the direction that they would if there were an object on the left.
The brain chooses the most likely cause for the rays to be coming in that direction - and that's that there is an object on the left.
Exactly why it does that is a psychological question, but when humans were evolving mirrors weren't around, although the refraction in water effect, or reflection from still pools could have been seen.
So, how can an image of a virtual object form if the rays do not diverge from a particular point in the first place?
The image in your question shows a "virtual object". It does not show an image. You could create a real image from it, and in this case it would do exactly that in front of the mirror, if you finished drawing the rays.
This is just a definition, which is somewhat counterintuative, and it completes the set of real and virtual objects and images, the other three of which are somewhat more intuative.
- Light diverges from a real object
- Light appears to diverge from a virtual image (when an optic reflects or refracts it)
- Light converges on a real image
- Light appears to converge on a virtual object (except an optic gets on the way and refracts or reflects the light)
For real life examples its somewhat harder to come up with simple examples as a virtual object isnt often much use on its own. So it might be formed as an intermediary in a larger optical system. Or even in this example. If you have an imaging system with a fold mirror at the end, that mirror would create a virtual object, similar to your picture here.
Best Answer
Most of the things you see are not emitting light. Usually they are reflecting light from light sources, and this reflected light is what you see. Typical light sources that do emit light in everyday life are the sun outside and light bulbs inside.