When is a virtual image obtained

In this section, let us look at the types of images formed by a convex mirror. When an object is placed at infinity, a virtual image is formed at the focus. A plane mirror always forms a virtual image behind the mirror. The image and object are the same distance from a flat mirror, the image size is the same as the object size, and the image is upright. The image formed by a plane mirror is always virtual and erect. The size of the image is equal to that of the object. The image formed is as far behind the mirror as the object is in front of it.

The image is laterally inverted. The main difference between real and virtual images lies in the way in which they are produced. A real image is formed when rays converge, whereas a virtual image occurs where rays only appear to diverge.

Virtual image refers to the image which forms when the light rays appear to meet at definite point, after reflection from the mirror. An erect image is formed by the actual intersection of rays.

It is an image in which directions are the same as those in the object. A real image occurs where rays converge, whereas a virtual image occurs where rays only appear to diverge.

Virtual images are formed by diverging lenses or by placing an object inside the focal length of a converging lens. The ray-tracing exercise is repeated for the case of a virtual image. Virtual images can also be produced by converging lenses when the object is placed inside the focal length.

Give one situation where a virtual image is formed? Answer: A virtual image is formed when reflected rays appear to meet. Such images cannot be obtained on screen. Plane mirrors, convex mirror and concave lens always forms virtual image. Answer: Image formed by a concave lens: The rays falling on a concave lens, after refraction, always diverge. Therefore, no matter where the object is kept, a diverging lens always forms a virtual image, which is erect and smaller in size than the object.

In optics, a virtual image is an image formed when the outgoing rays from a point on an object always diverge. Theimage appears to be located at the point of apparent divergence. Solution: A virtual image is formed when reflected rays appear to meet. Such images cannot be obtained on the screen. Plane mirrors, convex mirrors, and concave lenses always form virtual images.

An image is formed because light emanates from an object in a variety of directions. This is the right side of the book. It's the side that has the curvy part of the B so it'll look like this. So what this observer sees is an image that looks like this. It is what people call the mirror image.

It is flipped. The left and the right is flipped and you can think about why that is. I could just draw another ray right here to make it clear. If this ray is coming like this. Now, it will reflect and come out back like this to this observer it came from that point right over there. So he sees a flipped version of the book.

Now the whole reason why I did this is one, just to make you feel a little comfortable with these reflecting lines and all of that. But one, I guess more importantly to get you more comfortable with the idea of a virtual image.

This right here is a virtual image and we're going to compare it with a real image in the next video. And to some degree, a virtual image is more intuitive because we have so much experience with it when we think about mirrors or reflective surfaces. So it's a virtual image. And we call it a virtual image because the book really isn't there.

It's virtually there. There is no actual physical space, or we don't know if there's any physical space behind the image. Our brain just uses these diverging lights and creates a model inside of our brain to say, OK, that book exists there, even though the source of the light is over here.

Now I'm just going to draw another diagram, and you normally won't have the diagrams that have this type of perspective, but just to give you a sense of the same thing. And just to get you familiar with some of these diagrams that we're going to do when we study mirrors and lenses, is we could imagine that this is the ground, let's say that this is a mirror.

And let's say that this is actually could be somebody standing in front of a mirror. Although usually people will draw an arrow here to just say an arbitrary object, Well, let's just say we have an arrow in front of the mirror, just so you get used to this notation. This is actually a physical arrow, this is not a light ray.

Now let's think about what the image of this arrow-- let's say this arrow had eyes, so it's actually a person. So this arrow had eyes, what would this arrow see? Well, let's just pick an arbitrary point of this arrow. You could do it with any point-- this object-- because every point will be reflecting light diffusely. So I'm going to take one point that's coming straight out of the mirror-- one light ray that goes straight to the mirror-- so just parallel to the ground, straight to the mirror.

Well, it's just going to reflect straight off and then come back to the source of that light. Maybe that arrow's eye, if you view it as a person.

And let's just do another point, another ray coming from that point. So another ray coming from that point might come out like that. Incident angle is equal to reflected angle, so then it would come back like that. The objects can be of two types: 1 very small objects and 2 large objects or extended objects.

The small objects are represented by a dot in a ray diagram, while the large objects can be represented by an arrow pointing in upward direction. A real image is that image which is formed when the light rays coming from an object actually meet each other after reflection or refraction. A real image can be obtained on the screen. The real image is always inverted.

The common example of real image is the image formed on the cinema screen. A virtual image is that image which is formed when the light rays coming from an object do not actually meet, but appear to meet when produced backwards. These images cannot be obtained on the screen. The virtual image is always erect. The common example of virtual image is the image formed in the mirror when we stand in front of that mirror.