Reflection of light
Description
A light ray from the SOLID YELLOW
object strikes a vertical mirror at point O, and the reflected ray enters
the eye thus allowing the person to see the solid yellow object inside the
mirror shown as dotted lines. By projecting an imaginary normal line
through point O perpendicular to the mirror, known as the normal, we can
measure the angle of incidence, θi and the angle of reflection, θr. The
law of reflection states that θi = θr, or in other words, the angle of
incidence equals the angle of reflection. The dotted light rays shows the
imaginary lines that the image appears to come from assuming light travels
in a straight line path. The arrow head direction serves to symbolize the
direction of light travelling.
Play with the Reflection Mirror
Model to explore the following
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point object with simple ray, to multiple rays entering the eye.
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large object (BLACK) with multiple rays entering the eye
Sample Learning Goals
(a) recall and use the terms for reflection, including normal, angle of
incidence and angle of reflection
(b) state that, for reflection, the
angle of incidence is equal to the angle of reflection and use this
principle
in constructions, measurements and calculations.
Version:
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http://weelookang.blogspot.sg/2015/08/ejss-light-reflection-model.html