Lab 9. Lenses

Introduction

This experiment is designed to explore the relationship between object distance and image distance. Also, explore the magnification change of these images and examine the type of images changing over distance. 

Procedure

1. Find the focal length of lens.

2. Setup the device

3. Move lens from 5 x focal length toward 1.5 x focal length -> measure the data (image distance, image height)

Data/Discussion

1. Focal Length : 5.4 - 5.7 cm (using average value = 5.55 cm)
3. 

4. We did not see images on the board, because now we are getting the virtual images. By looking through the lens, we observed two images front and back : inverted to each other.

5. 

6. 

7, 8 & 9 

Slope = 0.4781
y-intercept = 0.1742

Conclusion

When objects were located beyond the focal length, we were able to observe a real but smaller images. However when the objects were set up closer than the focal length, we could get a virtual images. The magnification get bigger when the object distance was closer to the focal length.