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Grade 11 · Science · Physics

11th grade Convex lenses and where images form worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

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Convex lenses and where images form

Grade 11 Science Worksheet - Building Confidence

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

  1. A toy 3 cm tall stands 30 cm from a convex lens, and its sharp image forms 15 cm on the other side. How tall is the image, Ari?

  2. A toy 4 cm tall stands 20 cm from a convex lens, and its sharp image forms 60 cm on the other side. How tall is the image, Bo?

  3. A toy 1.5 cm tall stands 40 cm from a convex lens, and its sharp image forms 20 cm on the other side. How tall is the image, Esme?

  4. Read this first

    Ray diagram (example data)

    a convex lens with a focal length of 10 cm. A toy 2 cm tall stands 30 cm in front of it. Three principal rays leave the toy's top: one parallel to the axis bends through the far focal point; one through the lens center goes straight; one through the near focal point leaves parallel. They meet 15 cm beyond the lens, where an image 1 cm tall forms upside down.

  5. In the ray diagram, how far from the lens does the image form, Jun?

    • 15 cm, on the far side
    • 10 cm, at the focal point
    • 30 cm, where the toy is

  6. In the ray diagram, which way up is the image, Kira?

    • Upside down
    • Sideways
    • The right way up

  7. In the ray diagram, could a screen placed 15 cm beyond the lens show the image, Luz?

    • No: it is a virtual image
    • Yes: it is a real image
    • No: lenses don't make images

  8. A ray from the toy passes through the very center of the lens. What does it do, Noah?

    • Reflects back
    • Bends through the focal point
    • Goes straight on without bending

  9. A ray from the toy passes through the near focal point before the lens. How does it leave the lens, Pia?

    • Through the far focal point
    • Parallel to the axis
    • Straight back

  10. A camera lens forms an image of a distant tree on its sensor. What is the image like, Tala?

    • Large, virtual and upright
    • The same size as the tree
    • Small, real and upside down

  11. A projector puts a small slide just beyond the lens's focal point. What image does it throw on the screen, Zee?

    • Virtual, so no image on the screen
    • Small, real and upright
    • Large, real and upside down
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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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