PencilGo

Grade 11 · Science · Physics

11th grade Convex lenses and where images form worksheet

6 printable versionsChallenge Me10 questions · answer keyFree · no account

Level: Building Confidence · On Level · Challenge Me

When it’s done, scan the sheet with your phone and PencilGo marks it and picks the next one. Create a free account

Version
Print

Convex lenses and where images form

Grade 11 Science Worksheet - Challenge Me

NameDate

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

  1. Use the sign rule on the sheet. A magnifying glass has f = 10 cm, and a stamp sits 6 cm from it. What is di, Ari?

  2. Use the sign rule on the sheet. A magnifying glass has f = 20 cm, and a stamp sits 12 cm from it. What is di, Bo?

  3. An object 30 cm from a lens gives a sharp image 15 cm on the other side. What is the focal length, Jun?

    • 45 cm
    • 22.5 cm
    • 10 cm

  4. A lens makes a same-size real image when the object and image are each 40 cm away. What is f, Kira?

    • 20 cm
    • 80 cm
    • 40 cm

  5. An object 12 cm from a lens gives a sharp image 60 cm away. What is the focal length, Luz?

    • 10 cm
    • 48 cm
    • 72 cm

  6. Milo says a real image made by one convex lens is upright. Agree or disagree?

    • Agree: lenses keep things the right way up
    • Agree: real images match the object
    • Disagree: it is upside down

  7. Noah says the image on a camera's sensor is the right way up. Agree or disagree?

    • Agree: the image is virtual
    • Disagree: it is inverted on the sensor
    • Agree: real images are upright on the sensor

  8. Pia says covering the top half of a lens removes the top half of the image. Agree or disagree?

    • Agree: each half of the lens makes half the image
    • Agree: the image disappears
    • Disagree: the whole image forms, but dimmer

  9. A projector's image is too small on the screen. How should the slide be moved, Tala?

    • Inside the focal length
    • Farther from the lens
    • Closer to the focal point, with the screen moved back

  10. A camera focuses on mountains far away. About where must its sensor sit, Zee?

    • At about one focal length behind the lens
    • At twice the focal length
    • Right against the lens
PencilGopencilgo.com

11th grade Convex lenses and where images form worksheet – printable
Print: 123456

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.

More physics

See all Physics

Every sheet you scan goes into your child’s record: dated, marked and ready for the year-end portfolio. Homeschool records

Ready for easier practice?

Print a sheet, scan it when it’s done, and PencilGo picks the next one.

Create a free account