Convex lenses and where images form
Grade 11 Science Worksheet
Circle the best answer, or write your answer on the line.
Use the sign rule on the sheet. A convex lens has f = 10 cm, and an object sits 30 cm from it. What is the image distance, Ari?
Use the sign rule on the sheet. A convex lens has f = 20 cm, and an object sits 60 cm from it. What is the image distance, Bo?
Use the sign rule on the sheet. A convex lens has f = 15 cm, and an object sits 25 cm from it. What is the image distance, Esme?
Using the table, which object distance gives a virtual image, Kira?
- 15 cm
- 30 cm
- 5 cm
Using the table, as the object moves from 30 cm to 15 cm, what happens to the real image, Luz?
Use the picture in question 4.
- It stays in the same place
- It moves farther away and gets bigger
- It moves closer and gets smaller
Use the sign rule on the sheet. A thin-lens answer comes out as di = −12 cm. What does the minus sign mean, Milo?
- Nothing: distances can't be negative
- The image is real and twice as far
- The image is virtual, on the object's side
Use the sign rule on the sheet. Why is f positive for a convex lens, Pia?
- It spreads light apart
- It brings parallel rays together at a real focus
- Its glass is thicker at the edges
An object is 30 cm from a convex lens and its image is at di = 15 cm. Using m = −di ÷ do, what is the image like, Ren?
- Half size and upright
- Twice the size and upright
- Half size and upside down
An object is 5 cm from a convex lens and its image is at di = −10 cm. Using m = −di ÷ do, what is the image like, Tala?
- Twice the size and upside down
- Half the size and upright
- Twice the size and upright
A 2 cm object is 15 cm from a convex lens, and its image is at di = 30 cm. How tall is the image, Zee?
- 1 cm, upside down
- 4 cm, upside down
- 4 cm, upright