Light: Geometric Optics

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Light Geometric Optics
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The Ray Model of Light
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The ray model of light assumes that light travels
in straight-line path called rays.
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Reflection
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For flat surfaces, it is found that the incident
and reflected rays lie in the same plane with the
normal to the surface.
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Law of Reflection
The angle of incidence equals the angle of
reflection.
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Diffuse reflection
Specular reflection
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Image Formation by a Plane Mirror
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For a plane mirror the image distance (distance
from mirror to image) equals the object distance.
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Real and Virtual Images
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How tall must a full-length mirror be? A woman
1.60m tall stands in front of a vertical plane
mirror. What is the minimum height of the mirror,
and how high must its lower edge be above the
floor, if she is to be able to see her whole
body? Assume her eyes are 10 cm below the top of
her head).
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