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Grade 11 · Science · Physics

11th grade Convex lenses and where images form worksheet

6 printable versionsOn Level10 questions · answer keyFree · no account

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Convex lenses and where images form

Grade 11 Science Worksheet

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Circle the best answer, or write your answer on the line.

  1. 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?

  2. 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?

  3. 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?

  5. Using the table, at what object distance is the image the same size as the object, Jun?

    • 20 cm
    • 10 cm
    • 30 cm

  6. Using the table, which object distance gives a virtual image, Kira?

    Use the picture in question 4.

    • 5 cm
    • 15 cm
    • 30 cm

  7. 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 moves farther away and gets bigger
    • It stays in the same place
    • It moves closer and gets smaller

  8. Use the sign rule on the sheet. A thin-lens answer comes out as di = +25 cm. Where is the image, Noah?

    • Inside the lens
    • On the far side: real
    • On the object's side, since the sign doesn't matter

  9. 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

  10. 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?

    • Twice the size and upright
    • Half size and upside down
    • Half size and upright

  11. 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
    • Twice the size and upright
    • Half the size and upright
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11th grade Convex lenses and where images form worksheet – printable
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About this worksheet

Convex lenses and where images form. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

  • I can draw the three principal rays (parallel → far focus; center → straight; near focus → parallel) and find where the image forms.
  • I can use the thin-lens equation, 1/f = 1/do + 1/di, for real images (di > 0) and virtual images (di < 0), and find f from do and di.
  • I can find image size from hi ÷ ho = di ÷ do, and use m = −di ÷ do for size and orientation.
  • I can explain cameras (small, real, inverted), projectors (large, real) and magnifying glasses (object inside f: large, upright, virtual). I know covering half a lens only dims the image.

Standard: none (TX, FL)

Words to know

convex lens: A lens thicker in the middle that brings light together

focal length (f): The distance from the lens to where parallel rays meet

real image: An image where light really meets; a screen can show it

virtual image: An image light only seems to come from; no screen can show it

magnification (m): m = −di ÷ do: size and which way up

Common mistakes

Your child flipped the ratio. Image height ÷ object height = image distance ÷ object distance.

Your child added the fractions. From 1/f = 1/do + 1/di, the image term is 1/di = 1/f − 1/do.

Your child dropped the minus sign. A negative image distance shows a virtual image on the object's side of the lens.

Questions parents ask

What is the most common mistake with convex lenses and where images form?

Your child flipped the ratio. Image height ÷ object height = image distance ÷ object distance.

Are these 11th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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