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1. The first incident ray is a parallel line from the tip of the object to the lens.
2. The second incident ray passes through the intersection of both axes from the tip of the object.
3. The third incident ray passes through the focal point in front of the lens from the tip of the object.
4. From the point where the incident ray touches the lens, draw a line towards the focal point at the backside of the lens.
5. The second incident ray passes up to the back of the lens.
6. From the tip of the third incident ray, draw a parallel line.
7. From the point where the three extended rays meet, draw a perpendicular line and you have formed your image.

1. Draw a parallel line from the tip to the lens for your first incident ray.
2. From the tip of the object, draw a line to the intersection of both axes for the second incident ray.
3. The third incident ray passes trough the focal point at the back of the lens from the tip of the given object.
4. Given the focal point in front of the lens and the point where the first incident ray touches the lens, draw a line passing through both points.
5. Draw a line parallel to the main axis from the point where the second incident ray touches the lens.
6. Then, extend the third incident ray.
7. From the point where the three extended rays meet, draw a perpendicular line and there you have it, your image!

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