8) Light and Lenses Explorer 🔦🔍

🏎 Light and Lenses Explorer STEM Project 🔍📑

This optics project focuses on refraction and the properties of lenses. You will investigate how convex (converging) and concave (diverging) lenses bend light to create different types of images, exploring concepts crucial to telescopes, microscopes, and eyeglasses.

The project is divided into two main phases: Quarter 1 for Design & Trifold Preparation and Quarter 2 for Building & Testing your model.

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💡 Phase 1: Concept & Design & Trifold Preparation (Quarter 1)

This critical phase involves defining the entire experiment, documenting the design plan, and preparing all non-data sections of your trifold display. You must prepare sections 1 through 5 below for your Quarter 1 deadline.

1. Hypothesis and Research Question

How does the shape of the lens affect the characteristics (magnification, inversion) of the resulting image?

• Research Question: “How does the lens type (convex vs. concave) affect the magnification and orientation of the image produced?”
• Hypothesis: If we use a convex (converging) lens at a specific distance, it will produce a real, inverted, and magnified image, while a concave lens will only produce a reduced, upright, virtual image.

2. Materials and Variables

List all items needed for the build and identify the elements that will be controlled or measured.

Materials You'll Need

• Convex lens (e.g., magnifying glass) and concave lens (if available)
• Light source (small flashlight or bright LED; candle only with adult supervision)
• Object (printed arrow, letter, or grid on paper taped to a small stand)
• Screen (white cardboard or thick white paper)
• Optical bench substitute: meter stick or long ruler/tape measure fixed on a table
• 2–3 simple lens holders (folded cardboard with slit, clay, or modeling putty)
• Dark room environment (recommended)

Variables

• Independent Variable: Type of lens (convex or concave) or object distance from the lens
• Dependent Variable: Image distance, image size/magnification, and image orientation
• Constants: Light source brightness, object size, same lens each trial.

3. Procedures (Design & Documentation)

Your Quarter 1 procedure focuses on the trifold content. The actual building steps are performed in Quarter 2.

1. Write your project title: “Light and Lenses Explorer”.
2. State your research question and hypothesis.
3. Draw a ray diagram showing how parallel light rays interact with both a convex and a concave lens.
   (Show a convex lens focusing rays to a point, and a concave lens spreading rays apart.)
4. Explain in a short paragraph the principle of refraction and the definitions of focal point and focal length.

4. Expected Results

Based on your research and knowledge of physics, what do you expect to happen?

When the object distance is greater than the focal length for the convex lens, a real, inverted image will form on the screen. As the object is moved closer to the lens (but still beyond the focal point), the image will move farther away and become larger. The concave lens will never form a real image on the screen, only a virtual, upright, reduced image (seen by looking through the lens).

5. Expected Conclusion (Pre-analysis)

How will your results theoretically support your hypothesis?

The experiment should support the hypothesis, confirming the distinct image formation rules for the two lens types. This demonstrates the practical application of refraction in optics and shows that lens shape determines how light is manipulated to form images (as in telescopes, microscopes, and eyeglasses).

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🛠 Phase 2: Working Model (Quarter 2)

In this phase, you will build a simple lens device (an “optics bench”) and use it to study image formation by convex and concave lenses.

Construction and Testing Procedures

1. Build a simple optics bench:
   • Lay a meter stick or long ruler on a table and tape it down so it does not move.
   • Mark the zero end as the object position.
   • Prepare lens holders by folding small pieces of cardboard into an “L” or “U” shape and cutting a slot so the lens can stand upright.
   • Prepare a screen holder by clipping or taping a piece of white cardboard to another folded piece of cardboard so it can stand upright on the bench.
2. Set up the object and light source:
   • Tape a printed arrow or letter onto a small piece of cardboard and place it at the 0 cm mark on the bench.
   • Shine a flashlight onto the object from behind or slightly below so it is well lit.
   • Darken the room as much as possible so images on the screen are easier to see.
3. Test 1 – Convex lens image formation:
   • Place the convex lens in its holder somewhere between 10 cm and 40 cm from the object (record this as the object distance, \( d_o \)).
   • Place the screen on the other side of the lens and slide it back and forth until a sharp, inverted image appears.
   • Measure and record:
     • Object distance \( d_o \) (object to lens)
     • Image distance \( d_i \) (lens to screen)
     • Image height compared to object (larger / smaller)
4. Test 2 – Change the object distance:
   • Move the lens closer to the object (for example from 30 cm to 20 cm) and repeat the procedure.
   • Again find the screen position where the image is sharp.
   • Record how the image distance and image size change when the object is moved.
5. Test 3 – Concave lens (if available):
   • Replace the convex lens with the concave lens in its holder.
   • Try to form an image on the screen; you should notice that a clear image does not appear on the screen.
   • Instead, look through the concave lens at the object and describe what you see (upright or inverted? larger or smaller?).
6. Analyze results:
   • Create a data table with columns for Object distance, Image distance, Image size, and Orientation.
   • Describe in words how a convex lens can form a real, inverted image on a screen, while a concave lens forms only a virtual, upright image that you must look through the lens to see.

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📜 Trifold Display Board Instructions

Your final project will be presented on a standard trifold display board (approx. 37 inches high and 48 inches wide when fully open).

Board Size & Suggested Layout

Organize your board to be easy to read from left to right and top to bottom.

Panel	Suggested Content
Top Center	Project Title (Big and Bold)
Left Panel	Question / Problem, Background / Introduction, Hypothesis
Center Panel	Materials, Procedures (steps), Photos / Diagrams, Graphs / Tables (your data)
Right Panel	Results (what happened), Conclusion, Reflection / What you learned

Design Tips for a Professional Look

• Title: Use a short, clear title that can be read from across the room.
• Clarity: Print all text on white or light-colored paper.
• Font Size Guidelines:
  • Title: 72 pt or bigger
  • Headings: 32–48 pt
  • Body text: 18–24 pt
• Aesthetics: Keep it neat—align boxes, use rulers, and avoid crowded text. Use 2–3 matching colors for borders and headings.
• Visuals: Add photos, labeled diagrams, and charts (your data) to make the board engaging.

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🎬 Helpful Videos

Image Formation by a Convex Lens (Student Demo)

This video shows a clear, student-friendly demonstration of how a convex lens forms real, inverted images on a screen at different distances.

Trifold Design Tutorial

Tip: Plan your layout on scrap paper first, then print, cut, and finally glue everything onto the board.