Worksheet

Convex lenses and where images form

Grade 11 Science Worksheet - Building Confidence

NameDate

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?

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

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

    • Sideways
    • The right way up
    • Upside down

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

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

  8. A ray from the toy travels parallel to the lens's axis. Where does it go after the lens, Milo?

    • Through the far focal point
    • Back toward the toy
    • Straight on, parallel

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

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

  10. A magnifying glass is held so a stamp is closer to it than its focal length. What image is seen, Ren?

    • Larger, upright and virtual
    • Smaller, upside down and real
    • The same size and real

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

    • Small, real and upright
    • Virtual, so no image on the screen
    • Large, real and upside down
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Convex lenses and where images form

Answer Key - Grade 11 Science Worksheet - Building Confidence

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?

    1.5 cm

  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?

    12 cm

  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?

    0.75 cm

  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?

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

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

    • Sideways
    • The right way up
    • Upside down

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

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

  8. A ray from the toy travels parallel to the lens's axis. Where does it go after the lens, Milo?

    • Through the far focal point
    • Back toward the toy
    • Straight on, parallel

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

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

  10. A magnifying glass is held so a stamp is closer to it than its focal length. What image is seen, Ren?

    • Larger, upright and virtual
    • Smaller, upside down and real
    • The same size and real

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

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