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What is the shape of wavefront in light diverging from a point source?
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What will be the shape of wave front of light coming from a point source place at infinity?
plane wavefront
What are virtual and real images and what is the difference between them?
Here we have to note down an interesting point. If we have a source of light, then the rays starting right from the source would be diverging definitely. Hence if the rays coming from a source is of diverging type then the source is a real one. If otherwise the rays assumed coming from a source is converging type then we can declare that the source would be a virtual one. Same manner to form an image on a screen the rays have to converge. So converging rays would give definitely a real image. If the rays which are destined to give an image are of diverging type then the image must be termed as virtual. To get the position of the virtual image we have to extend back the rays so as they meet at a point and we say that the rays appear to diverge from that point hence named as virtual image. Thus we generalize this way. In case of source if rays are of diverging then source is real, if converging then source is virtual. In case of image formation, if rays are converging then real image and if diverging then virtual image. This is the cute point to be realized and to be taught to the students of this generation.
The differences in converging lens and a diverging lens?
A diverging light ray spreads out (diverges) in different directions, while a convergent light ray comes together (converges) at a single point known as the focus.
Why will a diverging lens never produce a real image?
A diverging lens can only produce a virtual image, because the light passing through a diverging lens never converges to a point. The virtual image produced by a diverging lens is always right-side-up and smaller than the original object. The image and the object viewed are always on the same side of the lens. Diverging lenses are used as viewfinders in cameras.
What is the size of the shadow and the distance of the object from the light source when a shadow is formed?
If you are using a point light source, the shadow's size is the object's size divided by the distance from the light source to the object multiplied by the distance from the light source to the shadow.
What will be the shape of wave front of light coming from a point source place at infinity?
plane wavefront
What type of wavefront will emerge from a point source and distant light source?
For a point in space (or from a distant light object), spherical waves are emitted. From a point source on the surface of a liquid, circular waves will come out. In both cases the source will be the focus of the emitted waves.
Why are the light rays coming from a distant object are assumed to be parallel?
Instead of parallel rays, consider the light as a wave front. It leaves the source in a spherical wavefront. At a certain distance the sphere is so large and the curvature of the wavefront becomes so small that it can be considered locally flat, and behaves optically as though it were flat. At that point, the flat wave front is equivalent to parallel rays (which are perpendicular to the front).
What is reflection and refraction light?
Reflection of light is the bending of light from its point. while refraction is the diverging of light from its bearing.
What are virtual and real images and what is the difference between them?
Here we have to note down an interesting point. If we have a source of light, then the rays starting right from the source would be diverging definitely. Hence if the rays coming from a source is of diverging type then the source is a real one. If otherwise the rays assumed coming from a source is converging type then we can declare that the source would be a virtual one. Same manner to form an image on a screen the rays have to converge. So converging rays would give definitely a real image. If the rays which are destined to give an image are of diverging type then the image must be termed as virtual. To get the position of the virtual image we have to extend back the rays so as they meet at a point and we say that the rays appear to diverge from that point hence named as virtual image. Thus we generalize this way. In case of source if rays are of diverging then source is real, if converging then source is virtual. In case of image formation, if rays are converging then real image and if diverging then virtual image. This is the cute point to be realized and to be taught to the students of this generation.
The differences in converging lens and a diverging lens?
A diverging light ray spreads out (diverges) in different directions, while a convergent light ray comes together (converges) at a single point known as the focus.
Why real image don't form in plane mirror?
When diverging rays from a point source fall on the plane mirror, after reflection would once again diverge and never get a chance of converging. So any diverging rays cannot form a real image and they are considered to be coming from one point and that point is taken to be the virtual image.
Why will a diverging lens never produce a real image?
A diverging lens can only produce a virtual image, because the light passing through a diverging lens never converges to a point. The virtual image produced by a diverging lens is always right-side-up and smaller than the original object. The image and the object viewed are always on the same side of the lens. Diverging lenses are used as viewfinders in cameras.
What is the size of the shadow and the distance of the object from the light source when a shadow is formed?
If you are using a point light source, the shadow's size is the object's size divided by the distance from the light source to the object multiplied by the distance from the light source to the shadow.
Why concave lens has virtual focus?
Concave lenses would have only diverging action. So parallel beam of light after passing through a concave lens have to go diverged. Only converging waves could produce a real image on a screen. But diverging rays cannot meet at a point and so they appear to come from a point and hence that point is taken to be the virtual image
How can an electric bulb be considered as an extended source of light an as point source of light?
Either, depending on the situation. If you look at it from far away, the light seems to come from a single direction, and can be simplified as a point-source. If you are very close, the light comes from different directions, and such a simplification is no longer correct.
What is the main source of light in a scene in a three point lighting system?
Key light
