07_AP2_Focal_Length_of_a_Converging_Lens_SD

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name	period	date
	7. Focal Length of a Converging Lens / student designed
			7. Focal Length of a Converging Lens / student designed
7. Focal Length of a Converging Lens
Student Designed
Driving Question | Objective
What is the focal length of the converging lens provided by your instructor? Use the principles of refraction and the thin lens equation to experimentally determine the focal length of a converging lens.
Design and Conduct Your Experiment
It is your group’s responsibility to design and conduct an experiment whose data will support your answer to the driving question above. After you have determined an experimental setup and procedure, write an outline of the equipment setup and procedure you will use to collect data, identifying the steps in sequence and the points at which each piece of equipment will be used.
Suggested Materials and Equipment
Although you have the freedom to design your procedure using any reasonable equipment at your disposal, the following equipment is recommended for your experimental setup.
	PASCO Optics Track1 or PASCO Dynamics Track 
	PASCO Basic Optics Viewing Screen4
	with Optics Carriages2
	PASCO Adjustable Lens Holder5
	PASCO Basic Optics Light Source3
	Converging lens with unknown focal length
	1www.pasco.com/ap28
	2www.pasco.com/ap29
	3www.pasco.com/ap26
	4www.pasco.com/ap31
	
	
	
	
	PASCO Optics Track
	PASCO Dynamics Track Optics Carriages
	PASCO Basic Optics Light Source
	PASCO Basic Optics Viewing Screen
	
	
	
	
	5www.pasco.com/ap30
	
	
	
	
	
	
	
	PASCO Adjustable 
Lens Holder
	
	
	
Experimental Design	
Your goal is to experimentally determine the focal length of the converging lens provided by your instructor. Use available resources to help research and finalize your procedure and equipment configuration.
Once you are convinced that your procedure will accomplish the experiment's objectives, record your experimental setup and procedure in the following sections. 
Setup
Draw and/or describe your experimental setup such that a third party could recreate the same setup in an attempt to reproduce your experiment.
Procedure
Outline the procedure you will use in your experiment, listing all of the steps below. Your outline should be written such that a third party could follow the same procedure in an attempt to reproduce your experiment.
	
	
	
	
	
	
	
	
	
	
Collect Data
Perform your experiment and record all relevant data. Present your data below (or in an attached document) in a form that best suits the experiment format, such that a third party can understand your experimental results in an attempt to reproduce them.
Analysis Questions
1.	What is your experimental value for the focal length of your lens? How did you determine this value from your data?
	
	
	
2.	What are factors that might have caused error in your measured value of the focal length? Explain how each factor you list could have been avoided or minimized.
	
	
	
	
	
	
3.	Ask your teacher for the actual value of the focal length of your lens. Calculate the percent error between your experimental value and the actual value.
 
4.	What do you predict happens to the image distance from a converging lens as the object distance approaches the focal length of the lens? Justify your answer: use mathematical reasoning or data from your experiment, or both, to support your answer.
	
	
	
Synthesis Questions
1.	An object sits in front of a converging lens 27.2 cm away from it. If the image of the object is formed 68.3 cm on the opposite side of the lens, what is the focal length of the lens?
2.	A camera uses a 10.5 cm focal-length converging lens to focus the image of a person onto a piece of camera exposure film. If the person is 2.15 m away from the lens, how far away must the film be from the lens to focus the image on the film? Explain how the focus on a camera might work.
3.	Imagine you were given a converging lens and a meter stick and sent outside on a sunny day. In a few sentences, describe a method to measure, as accurately as possible, the focal length of the lens using only the lens, a meter stick, and your outside surroundings. Explain your reasoning.
	
	
	
	
	
	
	
		pasco / ps-3815	1
	4	pasco / ps-3815		
		pasco / ps-3815	5
ActualExperimental
Percent error100
Actual
-
=´