+ All Categories
Transcript
Page 1: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Pinhole CamerasPinhole CamerasConverging & Diverging Converging & Diverging

LensesLenses

Page 2: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Pinhole ImagePinhole Image

Page 3: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Pinhole CameraPinhole Camera

Image is upside down and left to right reversed

Size of image is determined by distance from pinhole to screen/film

The smaller the pinhole, the clearer the image & the dimmer the image

Page 4: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Pinhole Camera PicturePinhole Camera Picture

Page 5: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Pinhole Camera PicturePinhole Camera Picture

Page 6: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Pinhole Viewing of Partial Pinhole Viewing of Partial EclipseEclipse

Page 7: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Shape of a LensShape of a Lens

Page 8: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Types of LensesTypes of Lenses

Page 9: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Convex Lens TermsConvex Lens Terms

Page 10: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Three Rays to Locate Three Rays to Locate ImageImage

Ray parallel to axis bends through the focus. Ray through the focus bends parallel to axis. Ray through center of lens passes straight

through.

Page 11: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Characterizing the ImageCharacterizing the Image

Images are characterized in the following way– Virtual or Real– Upright or Inverted– Reduced, Enlarged, Same Size

Page 12: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Object Beyond 2fObject Beyond 2f

Image is– Real– Inverted– Reduced

Page 13: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Object at 2fObject at 2f

Image is– Real– Inverted– Same size

Page 14: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Object Between 2f and fObject Between 2f and f

Image is– Real– Inverted– Enlarged

Page 15: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Object at FObject at F

No Image is Formed!

Page 16: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Object Closer than FObject Closer than F

Image is– Virtual– Upright– Enlarged

Page 17: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Converging Lens ImagesConverging Lens Images

Page 18: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Eye OpticsEye Optics

Accommodation – Shockwave Applet

Page 19: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Normal EyeNormal Eye

In the normal eye, the cornea/lens system project an inverted, “focused” image on the retina – which is the screen.

Page 20: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Myopia -- NearsightednessMyopia -- Nearsightedness

In a nearsighted eye, the image is “focused” in front of the retina.

A diverging (concave) lens is used to cause the image to be “focused” at the retina.

Page 21: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Hyperopia -- Hyperopia -- FarsightednessFarsightedness

In a farsighted eye, the image is “focused” behind the retina.

A converging (convex) lens is used to cause the image to be “focused” at the retina.

Page 22: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

AstigmatismAstigmatism

In astigmatism, the cornea is irregularly shaped & the light focuses at multiple points.

The result is blurry or multiple images.

Page 23: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Concave Lens Ray TracingConcave Lens Ray Tracing

Ray parallel to axis refracts as if it comes from the first focus.

Ray which lines up with second focus refracts parallel to axis.

Ray through center of lens doesn’t bend.

Page 24: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Image Formed by Concave Image Formed by Concave LensLens

Image is always– Virtual– Upright– Reduced

Page 25: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Concave Lens Image Concave Lens Image DistanceDistance

As object distance decreases– Image distance

decreases– Image size increases

Page 26: Pinhole Cameras Converging & Diverging Lenses. Pinhole Image.

Image CharacteristicsImage Characteristics

CONVEX LENS – IMAGE DEPENDS ON OBJECT POSITION– Beyond F: Real; Inverted; Enlarged,

Reduced, or Same Size– Closer than F: Virtual, Upright, Enlarged– At F: NO IMAGE

CONCAVE LENS – IMAGE ALWAYS SAME– Virtual– Upright– Reduced


Top Related