Angle of reflection
Objective
Compare the reflection of light from various surfaces (e.g., loss of light, angle of reflection, reflected color).
It’s a Reflection
(a lesson plan from UEN)
Problem
When light hits a reflective surface at an angle, at what angle is it reflect?
How does the number of images change as the angle increases?
Variable
Changing angles.
Vocabulary
Angle of incidence - The angle at which light strikes a surface.
Angle of reflection - The angle at which light bounces off a surface.
Reflection – light bouncing off an object.
Materials
Protractor
Flat mirror
Hinged mirrors
Laser pointer
Ball
Alphabet Letters
Safety Concerns: Laser Pointers. Students will follow ALL instructions EXACTLY on how to use laser pointers. Failure to do so will result in being sent, immediately, to the
Objective
Compare the reflection of light from various surfaces (e.g., loss of light, angle of reflection, reflected color).
Vice-Principal and loss of further lab activity privileges.
Procedure
1. Place a mirror at the edge of the protractor. Use a laser pointer to shine a light from one angle of the protractor and determine at which angle it is being reflected. On your worksheet, complete Chart 1.
2. Place a hinged mirror at the edge of the protractor. Move the hinged part to the degree specified, and place a ball in front of the mirror. Count how many reflected images you see and complete Chart 2.
Objective
Compare the reflection of light from various surfaces (e.g., loss of light, angle of reflection, reflected color).
Names _____________________________________________________________
___________________________________________________________________
Absent _____________________________________________________________
It’s a Reflection
(a lesson plan from UEN)
Part I – Angle of Reflection
Complete this section before you begin.
Hypothesis
___________________________________________________________________
___________________________________________________________________
Complete this section while doing the experiment.
Chart 1
Angle of
Incidence
Angle of
Reflection
20° 60° 80° 40° 70° 10° 50° 30°
Complete this section after you have finished your experiment.
1. Describe the results of this lab.
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
2. After analyzing your results, was your hypothesis correct or incorrect? Explain why.
___________________________________________________________________
Objective
Compare the reflection of light from various surfaces (e.g., loss of light, angle of reflection, reflected color).
___________________________________________________________________
___________________________________________________________________
Part II – Angle and Images
Complete this section before you begin.
Hypothesis
___________________________________________________________________
___________________________________________________________________
Complete this section while doing the experiment.
Chart 2
10° 30° 50° 70° Angle of
Mirrors
# of
Images
Complete this section after you have finished your experiment.
1. Describe the results of this lab.
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
2. After analyzing your results, was your hypothesis correct or incorrect? Explain why or why not.
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
Objective
Compare the reflection of light from various surfaces (e.g., loss of light, angle of reflection, reflected color).
Objective
Compare the reflection of light from various surfaces (e.g., loss of light, angle of reflection, reflected color).
It’s a Reflection - Key
Part I – Angle of Reflection
Hypothesis
Answers will vary.
Complete this section while doing the experiment.
Chart 1
Angle of
Incidence
20° 60° 80° 40° 70° 10° 50° 30°
Angle of
Reflection
20° 60° 80° 40° 70° 10° 50° 30°
Complete this section after you have finished your experiment.
1. Describe the results of this lab.
Example – The angle of incidence equals the angle of reflection.
2. After analyzing your results, was your hypothesis correct or incorrect? Explain why.
Answers will vary.
3. List two things you learned from this lab. a.
Answers will vary. b.
Answers will vary.
Part II – Angle and Images
Complete this section before you begin.
Hypothesis
Answers will vary.
Complete this section while doing the experiment.
Objective
Compare the reflection of light from various surfaces (e.g., loss of light, angle of reflection, reflected color).
Chart 2
Angle of
Mirrors
10° 30° 50° 70°
# of Images
Answers will vary.
Complete this section after you have finished your experiment.
1. Describe the results of this lab.
Example – The larger the angle, the more images you see.
2. After analyzing your results, was your hypothesis correct or incorrect? Explain why.
Answers will vary.
3. List two things you learned from this lab. a.
Answers will vary. b.
Answers will vary.
