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Old May 2nd 2016, 11:54 AM   #1
Join Date: Mar 2016
Location: Manchester
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Lenses system

I am having some trouble understanding a question involving a lens system, which is as follows:

A 20cm tall object is placed 80cm in front of a -6.75D lens. A second lens of power +3.00D is placed 7.5cm behind the first lens. The lens system is aligned so that the lenses are co-axial.

Calculate the position and size of the image produced, and state the nature of the image.

I first tried treating each lens separately to determine the image position and found a value for the image position di = -50cm for the full system but I'm not sure if this is correct. The nature if I found for the image was that it was virtual, magnified and upright. I am hoping maybe someone can verify my results. Would be a great help indeed
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Old Sep 26th 2016, 03:21 AM   #2
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A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis. Lenses are made from materials such as glass or plastic, and are ground and polished or moulded to the desired shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing. Devices that similarly focus or disperse radiation other than visible light are also called lenses, such as microwave lenses, electron lenses or acoustic lenses.

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