Objectives
The objective of this experiment is to determine a relationship between the object distance d0, the image distance di, and the image height hi. This can be accomplished by increasing the focal length by an integer value each trial. We began this experiment by measuring the focal distance of the lense that we were using. To do this we used the sum as our source and moved the lens until the light was focused at a single point. We then measured the distance from this point to the lens. We determined that the focal distance for our particular lens to be about 20.0 centimeters. We then shined an image through our lens and measured the object distance, image distance, object height, image height, and we calculated the magnification. We also stated whether or not the image was inverted.
Materials:
Socket lamp with V-shaped filament
Large converging lens
Large split lens or masking tape
Lens holder for large lens
cardboard
Meter stick
Procedures:
1. (a) Put the object in front of the convex mirror and observe the size and the orientation of the image
(b) Observe the location of the image
(c) Observe the change in image when moving the object closer or further from the mirror
2. Repeat #1 for concave mirror
Data and Analysis
Focal length (f) = 15.5 ± 0. 5 cm
Table 1: Recorded data of the object and image distances and heights
Object distance as a multiple of f(cm)
|
Object distance(cm)
|
Image distance(cm)
|
Object height(cm)
|
Image height(cm)
|
M
|
Type of image
|
5f
|
77.5 ± 0.5
|
28.70 ± 0.5
|
8.50 ± 0.2
|
3. 0 ± 0.5
|
0.35
|
Diminished, Inverted, real
|
4f
|
62.0.0 ± 1.00
|
28.5 ± 0.5
|
4.20 ± 0.2
|
0.494
|
Diminished, Inverted, real
| |
3f
|
46.5 ± 0. 5
|
34 ± 0.5
|
6.40 ± 0.5
|
0.75
|
Diminished, Inverted, real
| |
2f
|
31.0 ± 0.20
|
51.70 ± 0.2
|
14.50 ± 1
|
1.71
|
Same size, Inverted, real
| |
1.5f
|
23.0 ± 0.5
|
96 ± 2
|
38.2 ± 2
|
4.49
|
Magnified, Inverted, real
|
Observations:
- For convex mirror, the image formed is smaller than the object, and it is upright. The image seems to locate deep inside the mirror. As I move the object closer to the mirror, the image is getting larger and closer to the object's size, and it is getting smaller when I move the object away.
- For concave mirror, the image formed is larger than the object, and it is inverted. The image seems to locate not as deep as the convex mirror. As I move the object closer to the mirror, the image is getting smaller and closer to the object's size, and it is getting larger when I move the object away. The orientation would change as I move the object back and forth.
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