Where am I? Plane Mirrors
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1 Where am I? Plane Mirrors 3.1 Represent and reason Two mirrors are placed together at a right angle, with one mirror oriented vertically and the other oriented horizontally. A ray strikes the horizontal mirror at an incident angle of 60º relative to the normal line, reflects from it, and then hits the vertical mirror. 1. Determine the angle of incidence to the vertical mirror 2. Determine the angle of reflection from the vertical mirror 3. Use the drawing to prove that the beam leaves the second mirror parallel to its original direction. N angle of incidence = 60
2 3.2 Observe and explain - pointing at the reflection In our classroom, a candle is positioned in front of a plane mirror. Students observe the image of the candle in the mirror. Each student points a meter stick in the direction of the image they see in the mirror. a. Draw lines extending from each ruler through the other side of the mirror. What is at the point where all the lines converge? b. Do all the observers agree on this location? How do you know? c. Is it OK to say that image of the candle is behind the mirror? Why, or why not? d. Suggest a rule that could explain where a plane mirror forms the image of an object.
3 3.3 Predict and test - where is the image? Kyle and Katrina are investigating the image of a toy produced by a plane mirror. Kyle says the image is on the surface of the plane mirror. Test his idea by designing an experiment whose outcome contradicts a prediction based on his idea. a. What does Kyle mean? b. Describe an experiment to test Kyle's idea c. Predict the outcome of the experiment based on Kyle's idea d. Perform the experiment and record the outcome e. Discuss whether the experiment disproves Kyle's idea
4 3.4 Represent and reason - size of image in a plane mirror a. Use a ray diagram to determine the size of the image of this candle. Hint: locate the image of the tip of the flame, and locate the image of the bottom of the wax. b. How does the size of a plane-mirror image change (increase or decrease) when the object is moved farther away? c. How does the size change when the object is moved closer? d. Summarize your conclusions about how the size of the image changes as the object moves.
5 3.5 Predict and test - viewing your face in a mirror a. Use a ray diagram to predict whether or not this man can see his whole face in this small mirror. b. Draw a ray diagram to predict whether he will be able to see more or less face when the mirror is far, and when the mirror is close. c. How will the man's view change as the small mirror is moved from vary close to far away? d. Test this prediction using your own face and a small mirror. Does the result match your prediction?
6 3.6 Represent and reason - size of a dressing mirror Imagine that you stand in front of a plane mirror to look at your image. (a) Draw a ray diagram to determine the minimum size of a mirror in which you can see your entire body. (b) Where should you put the top of the mirror relative to the top of your head?
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