light: geometric optics
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Light: Geometric Optics
The Ray Model of Light
The ray model of light assumes that light travels in straight-line path called rays.
Reflection
For flat surfaces, it is found that the incident and reflected rays lie in the same plane with the normal to the surface.
Law of Reflection
The angle of incidence equals the angle of reflection.
Diffuse reflection Specular reflection
Image Formation by a Plane Mirror
For a plane mirror the image distance (distance from mirror to image) equals the object distance.
Real and Virtual Images
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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