Download Jan 7 - angles of reflection

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Geometry 9
Chapter 3 Review
• In Chapter 3 we developed relationships
involving congruent angles, parallel lines,
perpendicular lines and polygons
• In Chapter 4 we will look at congruent
polygons & triangles
Reflection of Light
Geometric Optics
Law of Reflection
The law of reflection states that the angle of reflection equals the angle of
incidence: θr = θi.The angles are measured relative to the perpendicular to
the surface at the point where the ray strikes the surface.
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Connexions. "The Law of Reflection." CC BY 3.0 http://cnx.org/content/m42456/latest/?collection=col11406/1.7 View on Boundless.com
Geometric Optics
Mirror Reflection
An image in a mirror appears as though it is behind the mirror.The two rays shown
are those that strike the mirror at just the correct angles to be reflected into the eyes
of the viewer.The image appears to come from the direction the rays are coming
from when they enter the viewer's eyes.
Free to share, print, make copies and changes. Get yours at www.boundless.com
Connexions. "The Law of Reflection." CC BY 3.0 http://cnx.org/content/m42456/latest/?collection=col11406/1.7 View on Boundless.com
Activity 1
• Page 195
• You will work in groups of three
To explain activity 1 on textbook page
195
Scoring Rubric: 4 marks
• 4/4 Explanation are thorough. Explanatory drawing are
neat and accurate and clearly explain why incident and
reflected rays must be parallel using a Theorem or
Postulate
• 3/4 Explanation lacks details or is not accurate. Drawings
are neat and mostly accurate.
• 2/4 Explanation contain both major and minor errors.
Does not contain a Theorem or Postulate in the
explanation.
• 1/4 Satisfactory answers are given but no work is shown.