PhysicsLAB Worksheet
Thin Lens Equation #1: Converging Lenses

Directions: Work these problems on notebook paper, boxing in your answers. Although polished rays diagrams are not required, sketches for each situation are recommended. Once all four problems are completed, make sure that your paper is signed and dated.
 
Some resources that you might find useful are:
  1. resource lesson on converging lenses
  2. resource lesson on the thin lens equation
  3. resource lesson on converging lens examples
  4. physlet on converging lenses
 
 
Refer to the following information for the next six questions.

A converging lens has a focal length of 20 cm.
If it is placed 50 cm from an object, how far from the lens will the image be formed? 

Which case is this?





 
Is it real or virtual?
 
Is it upright or inverted?
 
What is the magnification? 

Based on your magnification, is the image enlarged, reduced, or the same size as the object?
 
Refer to the following information for the next six questions.

An object is placed 10 cm from a converging lens of focal length 5 cm.
How far from the lens will the image be formed? 

Which case is this?





 
Is it real or virtual?
 
Is it upright or inverted?
 
What is the magnification? 

Based on your magnification, is the image enlarged, reduced, or the same size as the object?
 
Refer to the following information for the next six questions.

An object placed 30 cm from a converging lens forms a real image 60 cm from the lens.
What is the focal length of the lens? 

Which case is this?





 
Is it upright or inverted?
 
What is the magnification? 

Based on your magnification, is the image enlarged, reduced, or the same size as the object?
 
If the object is 5 cm tall, how tall is the image? 

Refer to the following information for the next six questions.

When a 5.0 cm tall object is placed 12 cm from a converging lens, an image is produced on the same side of the lens as the object, but 60 cm away from the lens.
What is the focal length of the lens? 

Which case is this?





 
Is it real or virtual?
 
Is it upright or inverted?
 
What is the magnification? 

How tall is the image? 





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