PhysicsLAB Worksheet
Thin Lens Equation #4: Both Types

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Work these problems in your notebooks, boxing in your answers. Sketches for problems 1-3 are  required. Once all four problems are completed, make sure that your paper is signed and dated.
 
Refer to the following information for the next four questions.

An initial lens has a focal length of 20 cm. When the lens is positioned 15 cm from a 5.0-cm tall object, an enlarged virtual image is formed.
What type of lens is it?
 
How far from the lens was the image formed? 

Was the image upright or inverted?
 
How tall was the image? 

Refer to the following information for the next four questions.

The 5.0-cm tall object is now placed 20 cm in front of a second lens, which has a focal length of 5 cm. A reduced virtual image is formed.
What type of lens is it?
 
How far from the lens was the image formed? 

Was the image upright or inverted?
 
How tall was the image? 

Refer to the following information for the next four questions.

Next the 5.0-cm tall object is positioned 15 cm in front a third lens forming a real image 10 cm behind the lens.
What type of lens is it?
 
Was the image upright or inverted?
 
How tall was the image? 

What was the focal length of this third lens? 

Refer to the following information for the next eight questions.

The 5.0-cm tall object was used in a final experiment with a fourth lens. Two groups come and take measurements. Each group records that their image is twice as tall as their object. But the first group states that a real image was formed; while the second group states that their image was virtual. Use the fact that the lens has a focal length of 10 cm to answer the following questions.
 
What type of lens were they using?
 
How tall was the image that each group measured? 

Was Group #1's image upright or inverted?
 
Where did Group #1 place their 5-cm tall object? 

Where was the image for Group #1 located? 

Was Group #2's image upright or inverted?
 
Where did Group #2 place their 5-cm tall object? 

Where was the image for Group #2 located? 




 
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