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UL L3 Video Clip 1: Student responds to CQ 3-1
A student in the class explains why he chose B.
UL L3 Video Clip 2: Class explains answer to CQ 3-2 (SQ #1)
The instructor asks students to explain why choices A or C or D are not correct.
UL L3 Video Clip 3: Group 2 discusses CQ 3-3 (SQ #2)
Brianna says why it cannot be A or C. Then they think about B and D and realize that the light bends too much in B. Therefore it has to be D.
UL L3 Video Clip 1: Student responds to CQ 3-1
UL L3 Video Clip 1: Student responds to CQ 3-1