PhysicsLAB Worksheet
Two-Lens Worksheet
Refer to the following information for the next nine questions.

Group #1
 
An object is placed 1.8 cm in front of a converging lens having a focal length of 0.5 cm. A second identical converging lens is located 1.5 cm behind the first lens as shown below.
 
Where is the first image formed? 

What is the magnification (di/do) for the rays passing through the first lens? 

This first image will now serve as the object for the second lens. How far is it located in front of the second lens? 

Where is the image formed by the second lens? 

What is the magnification (di/do) for the rays passing through the second lens? 

What is the final magnification for this system of lenses? 

The final image of this system is
 
The final image of this system is
 
The final image of this system is
 
Refer to the following information for the next nine questions.

Group #2
 
An object is placed 0.7 cm in front of a converging lens having a focal length of 0.5 cm. A second diverging lens, having a focal length of -0.5 cm,  is then placed 2.5 cm behind the first lens as shown below.
 
Where is the first image formed? 

What is the magnification (di/do) for the rays passing through the first lens? 

This first image will now serve as the object for the second lens. How far is it located in front of the second lens? 

Where is the image formed by the second lens? 

What is the magnification (di/do) for the rays passing through the second lens? 

What is the final magnification for this system of lenses? 

The final image of this system is
 
The final image of this system is
 
The final image of this system is
 
Refer to the following information for the next nine questions.

Group #3
 
An object is placed 1.5 cm in front of a converging lens having a focal length of 0.5 cm. A second converging lens, having a focal length of 1.0 cm,  is then placed 1.0 cm behind the first lens as shown below.
 
Where is the first image formed? 

What is the magnification (di/do) for the rays passing through the first lens? 

This first image will now serve as the object for the second lens. How far is it located in front of the second lens? 

Where is the image formed by the second lens? 

What is the magnification (di/do) for the rays passing through the second lens? 

What is the final magnification for this system of lenses? 

The final image of this system is
 
The final image of this system is
 
The final image of this system is
 
Refer to the following information for the next nine questions.

Group #4
 
An object is placed 2.15 cm in front of a converging lens having a focal length of 0.5 cm. A second converging lens, having a focal length of 0.75 cm,  is then placed 1.25 cm behind the first lens as shown below.
 
Where is the first image formed? 

What is the magnification (di/do) for the rays passing through the first lens? 

This first image will now serve as the object for the second lens. How far is it located in front of the second lens? 

Where is the image formed by the second lens? 

What is the magnification (di/do) for the rays passing through the second lens? 

What is the final magnification for this system of lenses? 

The final image of this system is
 
The final image of this system is
 
The final image of this system is
 



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