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Published byPenelope Zoe Lindsey
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Pinhole Cameras Converging & Diverging Lenses
Pinhole 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
Pinhole Camera Picture
Pinhole Viewing of Partial Eclipse
Shape of a Lens
Types of Lenses
Convex Lens Terms
Three Rays to Locate Image Ray parallel to axis bends through the focus. Ray through the focus bends parallel to axis. Ray through center of lens passes straight through.
Characterizing the Image Images are characterized in the following way – Virtual or Real – Upright or Inverted – Reduced, Enlarged, Same Size
Object Beyond 2f Image is – Real – Inverted – Reduced
Object at 2f Image is – Real – Inverted – Same size
Object Between 2f and f Image is – Real – Inverted – Enlarged
Object at F No Image is Formed!
Object Closer than F Image is – Virtual – Upright – Enlarged
Converging Lens Images
Eye Optics Accommodation – Shockwave Applet
Normal Eye In the normal eye, the cornea/lens system project an inverted, “focused” image on the retina – which is the screen.
Myopia -- 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.
Hyperopia -- Farsightedness 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.
Astigmatism In astigmatism, the cornea is irregularly shaped & the light focuses at multiple points. The result is blurry or multiple images.
Concave 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.
Image Formed by Concave Lens Image is always – Virtual – Upright – Reduced
Concave Lens Image Distance As object distance decreases – Image distance decreases – Image size increases
Image 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
Lenses, Mirrors & the Human Eye
L 31 Light and Optics-3 Images formed by mirrors
Characteristics of Lenses Lens Is a transparent object with at least one curved side that causes light to refract. Have 2 sides Either side could.
Physics 1161 – Lecture 23 Lenses
Light and Optics Mirrors and Lenses. Types of Mirrors Concave mirrors – curve inward and may produce real or virtual images. Convex mirrors – curve outward.
The Eye and Sight Contrast ways in which light rays are bend by concave and convex lenses. Describe how a prism forms a visible spectrum Explain why different.
Optics. Spherical Mirrors Spherical mirror – a section of a sphere of radius R and with a center of curvature C R C Mirror.
Mirrors and Lenses: Mirrors reflect the light Lenses refract the light.
L 33 Light and Optics  images formed by mirrors
3.6: Mirrors & Lenses 12/15/14. Part 1: Mirrors A.Light is necessary for eyes to see 1.Light waves spread in all directions from a light. 2.The brain.
LENS any transparent object having two nonparallel curved surfaces or one plane surface and one curved surface Converging Lenses - thicker in middle than.
Optics: Lenses & Mirrors. Thin Lenses Thin Lenses: Any device which concentrates or disperses light. Types of Lenses: Converging Lens: Parallel rays.
CH 14: MIRRORS & LENSES 14.1: Mirrors. I. Plane Mirrors Flat, smooth mirror Creates a virtual image: an image your brain perceives even though no.
Thin Lens Equation Distances of virtual images are negative & distances of real images are positive. Heights are positive if upright (above P.A.) and negative.
Your final homework (#12) is due Friday 25th April. This homework can be collected from my office area in SER 220 from Monday 28 th onwards (for exam revision).
The Camera The single-lens photographic camera is an optical instrument Components Light-tight box Converging lens Produces a real image Film behind the.
L 33 Light and Optics  images formed by mirrors –plane mirrors –curved mirrors Concave (converging) Convex (diverging) Images formed by lenses the human.
Refraction of Light EM lesson 8. Thicker in the center than at the edges Have positive focal lengths Converge parallel rays of light that pass through.
13.1 Lenses. Predicting Images in a Convex Lens.
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