Throughout the exercise, each student will be assigned a specific job. It is the teacher's discretion to assign or to allow student choice with group jobs. Recorder - writes for the group during the actual performance of the lab. Neatly arrange materials at your lab stations and know object locations as this lab will be performed in a darkened room. Turn on penlights.
Teacher darkens the room.
The Mirror Holder will rest one edge of the mirror on the sheet of paper, holding it perpendicular to the table at all times. The Recorder will draw a line on the paper indicating the location of the front edge of the mirror, as indicated in the diagram below. The Penlight Operator will then hold the light a distance of one half the mirror's height above the paper's edge and shine the beam onto the center of the mirror at an angle. The Chalkboard Eraser Operator will gently and lightly tap the erasers over top of the experimental set up, allowing the dust to fall down into and illuminate the beam from the penlight. Looking down over the top of the experimental set up, the Recorder will quickly trace the path the beam takes onto the paper beneath it.