Question

iii) between f and the lens.

1. draw in your lab report images, with the help of a ray diagram, for an object in all the three cases.

Explanation:

Step1: Recall ray - optics rules

For a converging lens, when an object is placed beyond 2F (twice the focal length), the rays from the object are drawn using the rules that a ray parallel to the principal axis passes through the focal point on the other side of the lens and a ray passing through the optical center goes straight without deviation.

Step2: Analyze object - position cases

Case 1: Object beyond 2F. The image formed is real, inverted and smaller than the object, between F and 2F on the other side of the lens. Case 2: Object at 2F. The image is real, inverted and of the same size as the object, at 2F on the other side of the lens. Case 3: Object between f and the lens. The image is virtual, upright and larger than the object, on the same side as the object.

Step3: Draw the ray - diagrams

On a piece of paper or in a drawing software, draw the principal axis, mark the optical center of the lens, the focal points F on either side of the lens. For each case, draw two principal rays from the top of the object to find the position of the top of the image. Repeat for other points on the object to get the complete image.

Answer:

Draw three ray - diagrams for the three cases as described above in the lab report, showing the object, the lens, the principal axis, the focal points and the rays forming the image for each case of object position.