The focal length of a lens

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Presentation transcript:

The focal length of a lens © D Hoult 2009

object

object

real image

real image real image

rays from one point on a distant object

rays from one point on a distant object

rays from one point on a distant object

rays from one point on a distant object Rays from one point on a distant object are very nearly

rays from one point on a distant object Rays from one point on a distant object are very nearly parallel

rays from one point on a distant object Rays from one point on a distant object are very nearly parallel The focal length of a lens is

rays from one point on a distant object Rays from one point on a distant object are very nearly parallel The focal length of a lens is the image distance when the object distance is 25 m or more

rays from one point on a distant object Rays from one point on a distant object are very nearly parallel The focal length of a lens is the image distance when the object distance is 25 m or more