UL L2 Video Clip 1: Group 1 discusses CQ 2-1 and 2-2

UL L2 Video Clip 1: Group 1 discusses CQ 2-1 and 2-2

Group 1 discusses CQ 2-1 (and 2-2). At first Vanessa thinks the mirror will be totally bright to the flashlight person. Mikayla thinks the flashlight person will see the mirror as dark and the white card as bright. She mentions that the opposite person will see a flash from the flashlight in the mirror. [She then leaves.] Megan and Vanessa are not sure. They think both observers will see both the mirror and white card as bright. Vanessa finely decides on A for CQ 2-1.

UL L2 Video Clip 2: Class explains CQ 2-2

UL L2 Video Clip 2: Class explains CQ 2-2

After seeing the movie of what actually happens the instructor asks someone in the class to explain why choice A in CQ 2-2 is the best answer. Three students respond.

UL L2 Video Clip 3: Group 2 discusses rule for how light reflects from mirror

UL L2 Video Clip 3: Group 2 discusses rule for how light reflects from mirror

Jonathan describes his idea in terms of equal slopes of lines. Brianna says they are mirror images of each other. Then they describe it in terms of equal angles. Brianna then wonders if it is always at the same angle. They refer back to CQ 2-3 for confirmation.

UL L2 Video Clip 4: Group 1 discusses CQ 2-4

UL L2 Video Clip 4: Group 1 discusses CQ 2-4

Group 1 argues for choice C (light just illuminates the white card; it does not reflect from it).

UL L2 Video Clip 5: Group 2 discusses CQ 2-4

UL L2 Video Clip 5: Group 2 discusses CQ 2-4

They think about the previous question with the flashlight and opposite person, and choose B (light reflects from card in many directions). Jonathan says that with a mirror the light is reflecting but with white paper the light is diffusing.

UL L2 Video Clip 6: Group 2 discusses CQ 2-5

UL L2 Video Clip 6: Group 2 discusses CQ 2-5

Group 2 agrees it cannot be either A or C or D and provide good reasons. They choose B.