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Concave and Convex Lenses PowerPoint Presentation
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Concave and Convex Lenses - PowerPoint PPT Presentation


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Concave and Convex Lenses. Convex lenses bulge outwards in the center Bends light inward at a spot just beyond the lens known as the focal point . Concave lenses Thinner in the middle and thicker on the edges Curves light rays outward (diverge). How You See Your Eye Convex Lens

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Presentation Transcript
slide1

Concave

and

Convex

Lenses

slide2

Convex lenses

  • bulge outwards in the center
  • Bends light inward at a spot just beyond the lens known as the focal point
slide3

Concave lenses

  • Thinner in the middle and thicker on the edges
  • Curves light rays outward (diverge)
slide4

How You See

  • Your Eye
    • Convex Lens
    • Image focuses on the retina near the optic nerve
    • Objects appear upside down until the brain turns the object right side up
slide5

Lenses to the Rescue

  • Far Sighted
    • Corrected by using a convex lens
    • Shortens the focal point
slide6

Lenses to the Rescue

  • Near Sighted
    • Corrected by using a concave lens
    • Expands the focal point