6.
4 Thin Lens Formula Worksheet Name _____________________
1. An object is placed 8 cm in front of converging lens. A real image is produced at 12 cm. Find the
focal distance of the lens.
2a. A 15.0 cm object is placed 60.0 cm from a convex lens, which has a focal length of 15.0 cm. Draw a ray
diagram and use the information from the ray diagram to fill in the box.
Type of Image
Orientation of Image
2F 30cm F F 2F
15cm 15cm 30cm
Size of Image
Image Distance
______________________
2b. A 15.0 cm object is placed 60.0 cm from a convex lens, which has a focal length of 15.0 cm. Use the thin
lens equation to find the distance of the image.
3a. A 15.0 cm object is placed 30.0 cm from a convex lens, which has a focal length of 15.0 cm.
Draw a ray diagram and use the information from the ray diagram to fill in the box.
Type of Image
Orientation of Image
2F F 15cm F 2F
30cm 15cm 30cm
Size of Image
Image Distance
3b. A 15.0 cm object is placed 30.0 cm from a convex lens, which has a focal length of 15.0 cm. Use the thin
lens equation to find the distance of the image.
4a. A 15.0 cm object is placed 25.0 cm from a convex lens, which has a focal length of 15.0 cm.
Draw a ray diagram and use the information from the ray diagram to fill in the box.
Type of Image
Orientation of Image
2F F F 2F Size of Image
30cm 15cm 15cm 30cm
Image Distance
4b. A 15.0 cm object is placed 25.0 cm from a convex lens, which has a focal length of 15.0 cm. Use the thin
lens equation to find the distance of the image.
5a. A 15.0 cm object is placed 15.0 cm from a convex lens, which has a focal length of 15.0 cm.
Draw a ray diagram and use the information from the ray diagram to fill in the box.
Type of Image
Orientation of Image
2F F 15cm F 2F
30cm 15cm 30cm Size of Image
Image Distance
5b. Explain why no image can be formed when the object is placed at the focal point.
6a. A 15.0 cm object is placed 10.0 cm from a convex lens, which has a focal length of 15.0 cm.
Draw a ray diagram and use the information from the ray diagram to fill in the box.
Type of Image
Orientation of Image
2F F F 2F
30cm 15cm 15cm 30cm Size of Image
Image Distance
6b. A 15.0 cm object is placed 10.0 cm from a convex lens, which has a focal length of 15.0 cm.
Use the thin lens equation to find the distance of the image.
7). A 2-meters-tall person is located 5 meters from a camera lens (camera lenses are convex lenses). The lens
has a focal length of 35 millimeters.. Find the distance where the image would appear.
8. A 1.0 cm object is placed 30.0 cm from a convex lens, which has a focal length of 10.0 cm.
Draw a ray diagram and use the information from the ray diagram to fill in the box.
Type of Image
Orientation of Image
2F F F 2F Size of Image
20cm 10cm 10cm 20cm
Image Distance
9. Determine the image distance and image height for a 5.5-cm tall object placed 54.0-cm from a
converging lens having a focal length of 20.0 cm.
10. Determine the image distance and image height for a 5.0-cm tall object placed 48.0-cm from a
converging lens having a focal length of 24.0 cm.
11. Determine the image distance and image height for a 4.8-cm tall object placed 26.0-cm from a
converging lens having a focal length of 16.0 cm.
12. Determine the image distance and image height for a 6.8-cm tall object placed 10.0-cm from a
converging having a focal length of 14.0 cm.
13. A magnified, inverted image is located a distance of 38.0 cm from a converging lens with a focal length
of 10.0 cm. Determine the object distance and tell whether the image is real or virtual.
14. An inverted image is magnified by 2 when the object is placed 26 cm in front of a converging lens.
Determine the image distance and the focal length of the lens.
15. A diverging lens has a focal length of -14.8 cm. An object is placed 38 cm from the lens's surface.
Determine the image distance.
16. Determine the focal length of a diverging lens that produces an image that is 16 cm from the lens (and
on the object's side) when the object is 34 cm from the lens.
17. A 2.65-cm diameter coin is placed a distance of 32 cm from a diverging lens that has a focal length of
-14 cm. Determine the image distance and the diameter of the image.
18. The focal point is located 22 cm from a diverging lens. An object is placed 10 cm from the lens.
Determine the image distance.
