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If a ray of light enters a transparent object like water or glass at an angle the path of the ray is deflected. When it emerges, it's deflected again, but in the opposite direction if the ingoing plane and the outgoing plane are parallel to one another. This effect is known as refraction.
When a parallel ray hits a convex lens this refraction causes it to emerge as a non-parallel ray and there will be a point at which the ray becomes very narrow - maybe showing as a spot of light. This is the point of focus.
If the lens is concave, the effect is reversed and the ray emerges as a steadily expanding ray.
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Is a lens that is thicker at the edges than in the middle a concave lens?
Yes, this is a concave lens. It is also called a diverging lens because it causes light rays to spread out.
Why diverging lens cannot be used as magnifying glass?
a diverging lens can not be used as a magnifying glass becuase a diverging lens( concave) lens diverges the the rays cousing the image to not be erect, but upside down. While magnifying glass ( convex) is used as it is a converging lens which focuses the rays in one point of an objects making it magnifies and erect.( right way up)
What is another name for a convex lens?
Concave and convex can refer the types of lenses used to treat refractive errors in the eyes. Concave is another word for myopic lens and convex is another name for a hyperopic lens also known as nearsighted and farsighted respectively
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
Is the concave lens bends light rays toward the center?
concave lens bends light rays away from the center
Is a lens that is thicker at the edges than in the middle a concave lens?
Yes, this is a concave lens. It is also called a diverging lens because it causes light rays to spread out.
Can a concave lens form a real image?
Never. Since the rays coming from a real object will always be diverging. The action of a concave lens is diverging action. Hence the already diverged rays will be dirverged further. Hence no chance of convergence. Only converging rays would form a real image. Hence the answer, NEVER.
Why diverging lens cannot be used as magnifying glass?
a diverging lens can not be used as a magnifying glass becuase a diverging lens( concave) lens diverges the the rays cousing the image to not be erect, but upside down. While magnifying glass ( convex) is used as it is a converging lens which focuses the rays in one point of an objects making it magnifies and erect.( right way up)
The function of the lens is to?
The function of lens is to to form an image of an object by converging or diverging rays of light from the object.
What is another name for a convex lens?
Concave and convex can refer the types of lenses used to treat refractive errors in the eyes. Concave is another word for myopic lens and convex is another name for a hyperopic lens also known as nearsighted and farsighted respectively
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
What kind of lens which diverges light rays?
Concave lens would diverge the rays.
Which light rays striking a concave mirror are reflected so that they pass through the focal point?
The tendency in case of concave lens would be diverging one. When parallel rays fall one side of the concave lens then due to divergence they appear to come, note down that "they appear to come" from a point on the same side. And this point is named as the virtual focus of the concave lens. Now as a ray passes through this virtual focal point that will be definitely a diverging one. Now due to diverging action of the lens, that ray will be further diverged and that will appear to come from a virtual point on the same side and some what nearer to the concave lens. Hence the image will be virtual and diminished and erect one.
Is the concave lens bends light rays toward the center?
concave lens bends light rays away from the center
What is nature of concave lens?
Lens that possesses at least one surface that curves inwards. It is a diverging lens, spreading out those light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness. Hope this helps you :)
Why do you get a virtual image?
In case of a concave lens the only possibility is that when parallel rays make an entry then they have to diverge. NO diverging rays can form a real image on a screen as they could not meet at a point. If the already diverging rays make an entry then they get diverged further and so no chance of getting real image. Hence the diverging rays appear to originate from a point on the same side of the object and so a virtual image. In case of a convex lens if the object is placed in between the optic centre and the focal plane then the refracting rays have to diverge and so virtual image. This is what a palmist does as he uses to see the lines on the palm to foretell the future.
What does concave lens do?
A concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens, meaning that it spreads out light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness (myopia). The writings of Pliny the Elder (23-79) makes mention of what is arguably the earliest use of a corrective lens. According to Pliny, Emperor Nero was said to watch gladiatorial games using an emerald, presumably concave shaped to correct for myopia.
