There are a few reasons why it is possible to simplify the number of actual refractions in a lens down to one refraction at a central line through the optical centre. One reason is that when light passes through a lens, the lens refracts the light in such a way that the light is brought to a focus. The amount of refraction that occurs depends on the curvature of the lens and the index of refraction of the lens material.
However, no matter how curved the lens is, the amount of refraction is always the same at the optical centre of the lens. This is because the optical centre is the point on the lens where the light rays passing through the lens are parallel to the principal axis of the lens.
Another reason why it is possible to simplify the number of actual refractions in a lens down to one refraction at a central line through the optical centre is that when a lens is rotated about its optical axis, the image formed by the lens does not rotate. This is because the optical centre of a lens is invariant with respect to rotation. This means that it is not necessary to take into account the actual refractions that occur at different points on the lens when calculating the image formation by the lens.
In case of concave lens the edges will be thicker compared to the central part. Whereas the convex lens has edges so thin compared to the central part. Concave lens would have only divergence effect. Parallel beam of light falling on one side of the concave lens after refraction would come out from the other side diverging out and so they appear to come from a point on the incident side of lens. So no real image is obtained. Thus the image will be a virtual image. If converging rays fall on the concave lens after refraction may be still converging but it convergence will be reduced a little bit and so instead forming a real image nearby the concave lens it will be formed somehow far away from the lens.
Yes, it is possible for an object to cast several shadows. One example, is that of a footballer on a floodlit pitch. If he is in the central region of the field, you will usually see four shadows: one from each of the corner floodlights.
True
Central acceleration is the acceleration placed on the center of a satellite that holds it in elliptical orbit. Central acceleration is more commonly known as centripetal acceleration.
A force between two particles that is not directed along the line connecting them; for example, a tensor force between two nucleons. anything that is not central force is a non central force. study about central forces to understand this better.
Not possible
Central America is in North America, Sherlock.
No.
Yes.
It is not possible
trip central means figuring out how to travel in the cheapest way possible.
possible but not highly
Not possible these days. Amtrak no longer has service to Grand Central Terminal. BTW - Grand Central Station is the subway station. The railroad station is Grand Central Terminal.
No, DNS is a central part of an AD.
rice
It is possible to purchase a Beam central vacuum from the following places: Amazon, eBay, ShopBot, Nextag, McHardy Vac, Superior Vacuums, Think Vacuums, Beam and at Beam Vac.
To maintain the largest margin of wealth possible.