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The image is called virtual because the light rays never really go there (compare this with a real image). The virtual light rays are drawn as dotted lines. The image is called upright because it is the right way up (compare this with an inverted image). The image is bigger than the object and on the same side of the lens as the object.

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Traffic control cabinets in the Blue Series include the Safer, Smarter, Greener ATCC Standard for customers looking to future-proof their intersections and the NEMA TS2 Type 1 and TS2 Type 2 for customers looking for the security of a product line with a history of safety and reliability.

Offers a variety of configurations to meet different customer needs, ensuring flexibility in traffic management solutions

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Unlike the previous page, the rays are diverging (moving apart) on the right side of the lens. The eye looks back along the rays that seem to have come from a point behind the object where the two rays of light cross. This is where you draw the top of the image. The bottom of the image is still on the principle axis.

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The picture below shows how to draw a ray diagram for an object that is nearer to the lens than F. Click here for a ray diagram for an object that is further away than F.

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The bottom of the object is placed on the principle axis. Two rays of light are drawn from the top of the object. The first ray of light is parallel to the principle axis and therefore passes through the focal point. The second ray of light goes from the top of the object and passes straight through the centre of the lens.

When the object is nearer to the lens than F (less than the focal length) a convex lens acts as a magnifying glass.

The Blue Series offers a variety of standard traffic control cabinet configurations to suit all customer needs and includes the most commonly asked-for features in traffic cabinets. With traffic control cabinets from the ATCC and NEMA, the Blue Series provides ready-to-ship traffic control cabinets for every market. The Blue Series offers a standard platform for customers with simplified training and troubleshooting.