PASCO OS-8500 INTRODUCTORY OPTICS SYSTEM - Manual (Page 26)

Introductory Optics System 012-02744K
®
20
Data Calculations
d
o
(mm) d
i
h
i
1/d
i
+ 1/d
o
1/f h
i
/h
o
-d
i
/d
o
500
450
400
350
300
250
200
150
100
75
50
Table 7.1: Data and Calculations
➂ What would happen to d
i
if d
o
were very, very large?
______________________________.
➃ Using your answer to question 4, measure the focal length of the lens.
Focal Length = ___________________________________________.
Now set d
o
to the values (in millimeters) listed in the table above. At each setting, locate the
image and measure d
i
. Also measure h
i
, the height of the image. (h
o
is the height of the
arrow on the crossed arrow target.)
Using the data you have collected, perform the calculations shown in the table.
➄ Are your results in complete agreement with the Fundamental Lens Equation? If not, to what
do you attribute the discrepancies?
__________________________________________________________________.
➅ For what values of d
o
were you unable to focus an image onto the screen? Use the Funda-
mental Lens Equation to explain why.
__________________________________________.
Additional Questions
➀ For a lens of focal length f, what value of d
o
would give an image with a magnification of one?
➁ Is it possible to obtain a non-inverted image with a converging spherical lens? Explain.
➂ For a converging lens of focal length f, where would you place the object to obtain an image
as far away from the lens as possible? How large would the image be?