rishurboi said:
I've heard virtual objects are used in cinema halls I'm not sure of what that means, can someone explain this to me please?
And btw by virtual object i mean when diverging rays from real object passes through a convex lens, the rays will converging and if you'll place a plane mirror infront of the the lens, a virtual object will form at the non-reflecting side of mirror. (Image below)
all I'm asking is what are some application of this in real life.
I suggest you search Google, using terms like "the difference between real and virtual images". You will get a massive range of hits and, between them, you should get an answer to your question (be careful not. However:.....
In cinemas, the image you see is Real because it's been projected on a solid screen and, as it's a set of points in space with different brightnesses it can actually be treated as a secondary object; the light from each part of that 'object' can be seen by everyone in the hall. You'd need to tell us where you "heard" an example of virtual images.
When you see your face in a mirror, THAT's a virtual image. Light rays arrive at your eye in the same way as they would if your face were where it 'appears to be' in the mirror. When you wear eye glasses, the rays enter your eye from a place that's
not where the object is but as if it's nearer (or further, depending) away from you - that's a virtual mage.
Otoh, real images are actually not often
seen in everyday life. They are formed by the rays from the points on an object are focused at an array of actual 'real' points, corresponding to the points of the original image. In a telescope, the large objective lens gathers the light arriving from a distant object and focuses them in a plane inside the scope. The real image is there but it's very hard to see because it's very small and you have to get y our eye in just the right place. You need another lens (the eyepiece lens) to turn the intermediate real image into a virtual image that's in a position way out in front of the scope (even infinity if it suits you) and which is easy to see.
If you have a concave shaving mirror then you can see a virtual image of your face when standing close up. But if you step back from the mirror, the image of your face goes distorted and, a bit further still and you will see an upside down image of your face which appears to be out in the room. It is real because the light rays come from a real position and go directly to you eye.
You can do the same sort of thing with the concave face of a shiny spoon. Move a pencil about, close in and you'll get a real inverted image of the tip, right in front of the spoon.
