Download Pinhole lab 2

20 Physics
Pinhole Camera Lab
Name:
Purpose:
i) To study how images are developed in simple cameras.
ii) To determine/verify the relationship between variables of a pinhole camera.
Materials:
pinhole camera
Procedure:
i)
ii)
iii)
iv)
meter stick
30 cm ruler
light source
Point the camera at the light source (the object) and adjust its orientation such that an image forms
on the back of the camera.
Vary the the distance to the object (do) and note the relationship between the distance to the object
and the height of the image (hI
Place the object a distance of 20 cm from the camera. Locate the image on the camera and measure
its height.
Repeat step iv four more times, increasing do by 20 cm each time.
Data:
ho =
_____________
do
(cm)
di =
_____________
hi
(cm)
hi/ho
di/do
% diff
Average
Questions:
1.
From what part of the object does light at the top of the image originate?
2.
What is the orientation of the image?
3.
What type of image is formed in a pinhole camera?
4.
What happens to the size of the image as do increases?
5.
Recall the pinhole camera equation suggests that:
hi/ho = di/do
Compare hi/ho to di/do for each do of your data table. That is, determine the percentage difference
between hi/ho and di/do for each do.
% difference = 2  x - y  x 100%
x+y
Now average the percentage difference values.
6.
Do your results agree with the pinhole camera equation? Explain.