Question

i) between f and 2f,
ii) beyond 2f, and
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 - diagram rules

For a converging lens, when the object is between $f$ and $2f$:

1. A ray parallel to the principal axis passes through the focal point on the other side of the lens.
2. A ray passing through the optical center of the lens goes straight without deviation.

The two rays intersect on the other side of the lens to form a real, inverted and magnified image.

Step2: Analyze object beyond $2f$

When the object is beyond $2f$:

1. A ray parallel to the principal axis passes through the focal point on the other side of the lens.
2. A ray passing through the optical center of the lens goes straight without deviation.

The two rays intersect on the other side of the lens to form a real, inverted and diminished image between $f$ and $2f$.

Step3: Analyze object between $f$ and the lens

When the object is between $f$ and the lens:

1. A ray parallel to the principal axis, when extended backwards, appears to come from the focal point on the same - side of the object.
2. A ray passing through the optical center of the lens goes straight without deviation.

The two rays, when extended backwards, intersect on the same side of the object to form a virtual, upright and magnified image.

Answer:

Draw the ray - diagrams as described above for each case in the lab report. For the object between $f$ and $2f$, draw a real, inverted and magnified image on the other side of the lens. For the object beyond $2f$, draw a real, inverted and diminished image between $f$ and $2f$ on the other side of the lens. For the object between $f$ and the lens, draw a virtual, upright and magnified image on the same side of the object.