Physics lab assignments
Kent State University
Act IV Lab 12
Exploring refraction in lenses
Report sheet
Name
Objective: To 1) measure the focal length of a convex or converging lens, 2) predict where images form when refracted by a convex lens, and 3) explain why object distance and image distance are inversely related.
Data:
Diopter value (power) of the reading glasses, if known:
Is the image the laptop or other light source virtual or real?
How do you know?
Object distance (do), cm
Image distance (di), cm
Calculated focal length (f), cm
Average
Power of your lens, in diopters :
If you knew the power of the lens when you obtained the glasses, how well does your calculation of the power agree with the manufacturer’s value?
Web extension
What are the more-or-less standard values of f/ ratios? With each increase in f/ number, what happens to the brightness of light passing through the lens?
Sources you consulted:
PR Photo (Proof you Really did the experiment)
Upload a photo (use of flash will probably be necessary, unless you have good camera) of you holding the lens in position in front of the laptop or other light source that you used.
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