Experiment 9. Converging and Diverging Lenses. Preparation. For this week's experiment read about the thin lens equation for converging and diverging lenses. Converging Lenses. As long as the object is outside of the focal point the image is real and inverted. When the object is inside the focal point the image becomes. Converging lenses are lenses which converge the light rays coming towards them, whereas diverging lenses are lenses which diverge the rays.

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Certainly two rays would be all that is necessary; yet the third ray will provide a check of the accuracy of our process.

## Converging and Diverging Lenses

Step-by-Step Method for Drawing Ray Diagrams The method of drawing ray diagrams for double convex lens is described below. The description is applied to the task of drawing a ray diagram for an object located beyond the 2F point of a double convex lens.

Pick a point on the top of the object and draw three incident rays traveling towards the lens. Using a straight edge, accurately draw one ray so that converging and diverging lenses passes exactly through the converging and diverging lenses point on the way to the lens.

Draw the second ray such that it travels exactly parallel to the principal axis. Draw the third incident ray such that it travels directly to the exact center of the lens.

## Converging Lenses - Ray Diagrams

Place arrowheads upon the rays to indicate their direction of travel. Once these incident rays strike the lens, refract them according to the three rules of refraction for converging lenses.

• The Anatomy of a Lens
• The Anatomy of a Lens
• Converging Lenses - Ray Diagrams
• Diverging Lenses

The ray that passes through the focal point on the way to the lens will refract and travel parallel to the principal axis. Use a straight edge to accurately draw its path.

### How are converging lenses different from diverging lenses?

The ray that traveled parallel to the principal axis on the way to the lens will refract and travel through the focal point. And the ray that traveled to the exact center of the lens converging and diverging lenses continue in the same direction. Extend the rays past their point of intersection.

Mark the image of the top of the object. The image point of the top of the object is the point where the three refracted rays intersect. All three rays should intersect at exactly the same point.

This point converging and diverging lenses merely the point where all light from the top of the object would intersect upon refracting through the lens.

Of course, the rest of the object has an image as well and it can be found by applying the same three steps to another chosen point. Repeat the process for the bottom of the object.

One goal of a ray diagram is to determine the converging and diverging lenses, size, orientation, and type of image that is formed by the double convex lens.

Typically, this requires determining where the image of the upper and lower extreme of the object is located and then tracing the entire image.

## How are converging lenses different from diverging lenses? | Socratic

After completing the first three steps, only the image location converging and diverging lenses the top extreme of converging and diverging lenses object has been found.

Thus, the process must be repeated for the point on the bottom of the object. If the bottom of the object lies upon the principal axis as it does in this examplethen the image of this point will also lie upon the principal axis and be the same distance from the mirror as the image of the top of the object.

At this point the entire image can be filled in.

Some students have difficulty understanding how the entire image of an object can be deduced once a single point on the image has been determined.

If the object is merely a vertical object such converging and diverging lenses the arrow object used in the example belowthen the process is easy.

The image is merely a vertical line. In theory, it would be necessary to pick each point on the object and draw a separate ray diagram to determine the location of the image of that point. That would require a lot of ray diagrams as illustrated converging and diverging lenses the diagram below.