how to make projector working model school science project for exhibition

A simple mobile projector using a cardboard box, convex lens, and mobile phone works by utilizing the lens to focus light from the phone’s screen, projecting an enlarged image onto a surface.

By adjusting the distance between the phone and the lens and ensuring a dark environment, this model effectively demonstrates basic principles of optics and projection technology.

Creating a working model of a projector using a cardboard box, a mobile phone, and a cardboard pipe can be a fun and educational science project for a school exhibition. This project demonstrates basic optics principles, including magnification and light projection.

Materials Needed:

  • Cardboard box (large enough to fit your mobile phone)
  • Mobile phone
  • Convex lens (magnifying glass lens)
  • Cardboard pipe (for moving the mobile phone)
  • Tape or glue
  • Scissors or a craft knife
  • Ruler
  • Marker
  • White paper or a piece of white cloth (for the projection screen)
  • Dark room or a space where you can control lighting

Step by step video Instructions:

  1. Prepare the Cardboard Box:
    • Choose a sturdy cardboard box. Cut out a rectangular opening on one side of the box that matches the size of your convex lens.
    • Secure the lens in this opening using tape or glue. Ensure it is firmly in place and centered.
  2. Create the Phone Holder:
    • Cut a piece of cardboard slightly larger than your mobile phone. This will act as the phone holder.
    • Cut two parallel slits on either side of the box’s interior to hold the cardboard pipe. These slits should allow the pipe to move back and forth.
  3. Attach the Cardboard Pipe:
    • Insert the cardboard pipe through the slits in the box. This pipe will act as a slider to move the phone back and forth.
    • Attach the phone holder to the cardboard pipe using tape or glue. Make sure it is secure and can move smoothly within the box.
  4. Position the Phone:
    • Place your mobile phone on the phone holder, screen facing the lens. Secure it with tape or an elastic band to prevent it from falling.
  5. Create the Projection Screen:
    • Place a piece of white paper or a white cloth on a wall or a flat surface to act as your projection screen. Ensure it is positioned directly in front of the lens and at a suitable distance.
  6. Prepare the Phone for Projection:
    • Adjust the phone’s display settings to maximum brightness.
    • Flip the screen upside down. This is because the lens will invert the image, so the projected image will appear correctly oriented.
  7. Test and Adjust:
    • Turn off the lights in the room to make it as dark as possible.
    • Play a video or display an image on your mobile phone.
    • Move the phone holder back and forth using the cardboard pipe to adjust the focus until the image on the screen is clear.
  8. Enhance the Projection:
    • If the image is not bright enough, try using a more powerful lens or placing the projector closer to the screen.
    • Ensure there are no light leaks from the box. Cover any holes or gaps with black tape or additional pieces of cardboard.

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