PHY213_Chapter23_Sec4to7

PHY213_Chapter23_Sec4to7 - Chapter 23 Mirrors and Lenses...

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Chapter 23 Mirrors and Lenses
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Medical Physics General Lenses Sections 4–7
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Medical Physics General Images Formed by Refraction Rays originate from the object point, O, and pass through the image point, I When n 2 > n 1 , real images are formed on the side opposite from the object
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Medical Physics General Flat Refracting Surface The image formed by a flat refracting surface is on the same side of the surface as the object – The image is virtual – The image forms between the object and the surface – The rays bend away from the normal since n 1 > n 2 Active Figure: Images Formed by Flat Refracting Surfaces
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Medical Physics General Atmospheric Refraction There are many interesting results of refraction in the atmosphere – Sunsets – Mirages
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Medical Physics General Atmospheric Refraction and Sunsets Light rays from the sun are bent as they pass into the atmosphere It is a gradual bend because the light passes through layers of the atmosphere – Each layer has a slightly different index of refraction The Sun is seen to be above the horizon even after it has fallen below it
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Medical Physics General Atmospheric Refraction and Mirages A mirage can be observed when the air above the ground is warmer than the air at higher elevations The rays in path B are directed toward the ground and then bent by refraction The observer sees both an upright and an inverted image – it appears as though the inverted image is a reflection in pool of water
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Medical Physics General Thin Lenses A thin lens consists of a piece of glass or plastic, ground so that each of its two refracting surfaces is a segment of either a sphere or a plane Lenses are commonly used to form images by refraction in optical instruments
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Medical Physics General Thin Lens Shapes These are examples of converging lenses They have positive focal lengths They are thickest in the middle These are examples of diverging lenses They have negative focal lengths They are thickest at the edges
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Medical Physics General Focal Length of Lenses The focal length, ƒ, is the image distance that corresponds to an infinite object distance – This is the same as for mirrors A thin lens has two focal points, corresponding
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PHY213_Chapter23_Sec4to7 - Chapter 23 Mirrors and Lenses...

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