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Animation and Explanation Slides for Lenses. On the back of Page 1. Code for diagrams. Types of Lines: Solid Lines = Light Rays Dashed Lines = Virtual Rays Dotted Lines = Guide lines (not a ray) Colors: Blue = Incident Light Rays Red = Reflected Light Rays Green = Virtual Rays

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Animation and Explanation

Slides for Lenses


Code for diagrams

On the back of Page 1

Code for diagrams

Types of Lines:

Solid Lines = Light Rays

Dashed Lines = Virtual Rays

Dotted Lines = Guide lines (not a ray)

Colors:

Blue = Incident Light Rays

Red = Reflected Light Rays

Green = Virtual Rays

Other:

Empty Block Arrow = Object

Filled Block Arrow = Image


Rules for lens diagrams
Rules for Lens Diagrams

  • Always draw the “check line” last.

  • 2 Rays are required to prove the image exists:

    • Ray 1: Start at the top of the object and draw a ray to the lens that is parallel to the normal. Refract through the lens to the focal point.

    • Ray 2: If possible*, start at the top of the object and draw a ray through the focal point to the lens. Refract through the lens with a ray that is parallel to the normal.

    • Ray 3: Draw the “check line” from the top of the object through the intersection of the normal and the lens.


Explanation of images
Explanation of Images

  • Real or Virtual?

    • If refracted light converges (meets together), a REAL image is formed

    • If refracted light diverges (spreads apart), a VIRTUAL image is formed

    • If refracted light is parallel, no image is formed.

  • Upright or Inverted?

    • If the refracted rays cross above the normal, image is UPRIGHT.

    • If refracted rays cross below the normal, image is INVERTED.

  • Reduced, Same Size, or Enlarged?

    • If the image formed is shorter than the original, it is REDUCED.

    • If the image formed is the same height as the original, it is SAME SIZE.

    • If the image formed is taller than the original, it is ENLARGED.


Convex lens beyond 2f
Convex Lens: Beyond 2F

2F

F

F

2F

Image:

Real

Inverted

Reduced


Convex lens @2f
Convex Lens: @2F

2F

F

F

2F

Image:

Real

Inverted

Same Size


Convex lens between 2f and f
Convex Lens: Between 2F and F

2F

2F

F

F

F

F

2F

2F

Image:

Real

Inverted

Enlarged


Convex lens @ f
Convex Lens: @ F

2F

2F

F

F

F

F

2F

2F

Image:

No image formed from parallel rays


Convex lens between f and lens
Convex Lens: Between F and Lens

2F

F

F

2F

Image:

Virtual

Upright

Enlarged


Concave lens any placement
Concave Lens: Any Placement

2F

F

F

2F

Image:

Virtual

Upright

Reduced



Convex lens beyond 2f1
Convex Lens: Beyond 2F

2F

F

F

2F

Image:

Real

Inverted

Reduced


Convex lens @2f1
Convex Lens: @2F

2F

F

F

2F

Image:

Real

Inverted

Same Size


Convex lens between 2f and f1
Convex Lens: Between 2F and F

2F

2F

F

F

F

F

2F

2F

Image:

Real

Inverted

Enlarged


Convex lens @ f1
Convex Lens: @ F

2F

2F

F

F

F

F

2F

2F

Image:

No image formed from parallel rays


Convex lens between f and lens1
Convex Lens: Between F and Lens

2F

F

F

2F

Image:

Virtual

Upright

Enlarged


Concave lens any placement1
Concave Lens: Any Placement

2F

F

F

2F

Image:

Virtual

Upright

Reduced


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