Description: A team of three students will work cooperatively to determine the path a light beam takes, as it reflects off a series of plane mirrors.
Event Supervisor: Ruth Cummins and Kathy Deckert
|Download the current rules here.|
|Small protractor template to print and cut out|
|Print your own LARGE FLOOR protractor|
|How to set-up for practicing for 2D (part two)
| How to build your own 2D practice set (easy to do)
|There may be a "Quick Start Kit" available for this event.|
|See the Elementary Workshop List for this season|
The white piece of paper is for the students to do whatever they need to in order to complete the task. They can write on it, tape things to it, whatever they think is necessary.
The target might be positioned anywhere in the room - on the wall, on the floor, on the ceiling - not necessarily perpendicular to the floor.
The team can use UP TO 1 minute to prepare with the room lights on, and the flashlight is off.
That prep time is recorded and used as a tie breaker if necessary
The lights in the room are turned off, and we give the student's eyes time to adjust to the dark
The judge counts down 3-2-1 and the light source (flashlight) is turned on at the same time that the clock starts for competition.
No, they will do part one in one room – just the team and their judges (and any spectators from that school). They will be in another room where a few teams will be working on Part 2. Spectators will be allowed into the part 2 room also (as long as they can watch in silence).
Students need to experiment to see which way is the best way to hold the mirrors. They need to think about how their feet should be positioned, how their hands are positioned, as well as how high they should hold the mirror. Whichever way is the most comfortable and most stable will vary with each student.
There is no set order; however you may want to put your steadiest student holding the first mirror since he/she will have to hold the light steady for the longest amount of time.
You should practice in a room about the size of a normal classroom. There should be plenty of furniture in the room. The furniture serves as obstacles that the students will have to work around. The room at the college will be a classroom with normal classroom furniture in it. Students will not be able to move the furniture.
Yes, they can, however they should not practice this. They won’t know what kind of furniture is in the room ahead of time. Depending on furniture to hold them steady may not work if the furniture is different from what they are used to.
You should have a team leader chosen before you get to the tournament. I will ask the team leader to tell me when they are ready. Remember, the planning time is recorded and used as a tie breaker.
The permanent mirror can be up to 6 inches higher, or 6 inches lower than the light source. The height of the light source may vary depending on the tables available in the room. Students should practice with the light source at varying table heights.
It is approximately 12 inches long with a diameter of approximately 1.75 inches.
The only things they can move are the 3 mirrors (that are provided by the Supervisor). They may not move the flashlight, protractor, permanent mirror, target or furniture in the room.
No, the permanent mirror can come anywhere in the series of mirrors reflecting the light. It will probably be the 2nd or 3rd mirror since it would be extremely difficult (or impossible) to make it the 1st or 4th mirror.
The most successful teams consistently get scores of 10 seconds or less for each of the 3D challenges.
Yes, I’ll have extra mirrors available. (Don’t worry, I’ve removed the 7 years bad luck hex on all Reflection Relay mirrors)
In the 3D challenge preparation time is a tie breaker, however in the 2 D challenge there is no advantage to being done early.
We will work hard to make sure the laser, target, and any barriers are solidly attached to playing field. However if they are bumped hard enough, they might be pushed out of place. Neither the event supervisor nor the students will be able to touch these pieces of equipment to try to put them back in their original position. At the end of the 5 minute work period, the laser will be turned on and the team’s score will be based on which mirrors and target areas the laser light reaches. Students should practice extreme care not to move the laser, target, or barriers.
The mirrors are mounted on the wood block with one mirror edge flush with the block edge.
This leaves a 1/2 inch gap on the opposite side of the block.
There is no actual 'top' or 'bottom'.
Students can position blocks any way they wish.