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Lecture14

# Lecture14 - Lecture 14 Image Formation Reflection and...

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Lecture 14: Image Formation

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Reflection and Refraction Last lecture we covered two of the behaviors of light: 1. Reflection from a smooth surface we found that the angle of incidence was equal to the angle of reflection: 1. Refraction as light passes from one transparent material into another Snell’s Law tells us how the incident and refracted angles are related: θ r = q a n a sin α = ν β σινθ
Image Formation The next topic we’ll explore is the formation of images images occur when light appears to originate in some place different from the object that reflected (or emitted) the light Probably the most common image is that formed by a flat mirror when we stand in front of the mirror, it appears to us that there’s a “copy” of us standing behind the mirror Here’s how it works: eye object image of object Light rays that enter the eye appear to “trace back” to image

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Size and position of the image We’ll see many more examples of image formation both from mirrors with different shapes and from lenses We want to determine the size and position of an image We can do this by considering only a few of the rays of light coming from the object and forming the image Object y s Image ψ σ
From the diagram on the previous slide we learn the following about the image formed by a flat mirror: the image is always behind the mirror. Such images are called virtual images the image has the same size as the object ratio of object to image size is called magnification the image is upright (arrow points upward for both object and image) the image appears the same distance behind the mirror as the

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Lecture14 - Lecture 14 Image Formation Reflection and...

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