P4 Physics pg 100

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  • Images and converging lenses
    • A real images is light from an object combining to form an image on screen
      • Virtual images can't be projected
      • A virtual image is the rays diverging, so the light from the object looks as if its coming from a completely different place
    • Converging lenses focus light
      • It causes rays of light to move together to focues
      • The focal length is the distance between the centre of the lens and the focal point
      • A ray travelling parallel to the axis slows down as it bends towards the normal
      • A ray passing through the optical centre of the lens seems to pass straight through
    • Convex lenses can turn diverging light rays into parallel light
      • Can make real or virtual images

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