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# Animation and Explanation Slides for Lenses - PowerPoint PPT Presentation

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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Presentation Transcript

Slides for Lenses

### 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

• 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.

• 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.

2F

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2F

Image:

Real

Inverted

Reduced

2F

F

F

2F

Image:

Real

Inverted

Same Size

2F

2F

F

F

F

F

2F

2F

Image:

Real

Inverted

Enlarged

2F

2F

F

F

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F

2F

2F

Image:

No image formed from parallel rays

2F

F

F

2F

Image:

Virtual

Upright

Enlarged

2F

F

F

2F

Image:

Virtual

Upright

Reduced

2F

F

F

2F

Image:

Real

Inverted

Reduced

2F

F

F

2F

Image:

Real

Inverted

Same Size

2F

2F

F

F

F

F

2F

2F

Image:

Real

Inverted

Enlarged

2F

2F

F

F

F

F

2F

2F

Image:

No image formed from parallel rays

2F

F

F

2F

Image:

Virtual

Upright

Enlarged

2F

F

F

2F

Image:

Virtual

Upright

Reduced