PHY213_Chapter23_Sec1to3

PHY213_Chapter23_Sec1to3 - Chapter 23 Mirrors and Lenses...

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Chapter 23 Mirrors and Lenses
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Medical Physics General Mirrors Sections 1–3
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Medical Physics General Notation for Mirrors and Lenses The object distance is the distance from the object to the mirror or lens – Denoted by p The image distance is the distance from the image to the mirror or lens – Denoted by q The lateral magnification of the mirror or lens is the ratio of the image height to the object height – Denoted by M = h’ / h
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Medical Physics General Images for Mirrors and Lenses A real image is one in which light actually passes through the image point – Real images can be displayed on screens A virtual image is one in which the light does not pass through the image point – The light appears to diverge from that point – Virtual images cannot be displayed on screens To find where an image is formed, it is always necessary to follow at least two rays of light as they reflect from the mirror or refract through the lens
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Medical Physics General Flat (Plane) Mirror Simplest possible mirror Properties of the image can be determined by geometry One ray starts at P, follows path PQ and reflects back on itself A second ray follows path PR and reflects according to the Law of Reflection
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Medical Physics General Flat (Plane) Mirror, cont The image is as far behind the mirror as the object is in front: q = p The image is unmagnified: M = 1 since h’ = h The image is virtual: light rays appears to diverge from behind mirror The image is upright: it has the same orientation as the object There is an apparent left- right reversal in the image Active Figure: A Plane Mirror
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PHY213_Chapter23_Sec1to3 - Chapter 23 Mirrors and Lenses...

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