** 4. A beam of light travels vertically downward and strikes a horizontal mirror, reflecting directly back vertically upward, as indicated by the black dashed line in the diagram at left. The mirror is now rotated, so that it is 10° away from horizontal, as is the red mirror in the diagram. The incident solid black ray is the same in both cases. a) At what angle from the vertical will the reflected beam (the red dashed arrow) now ' 10° be seen? b) If the mirror is further rotated until it is 20° from the horizontal, what will be the new angle between the reflected beam and the vertical?

College Physics
11th Edition
ISBN:9781305952300
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Chapter1: Units, Trigonometry. And Vectors
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** 4. A beam of light travels vertically downward and strikes a horizontal mirror, reflecting
directly back vertically upward, as indicated by the black dashed line in the diagram at left.
The mirror is now rotated, so that it is 10° away from horizontal, as is the red mirror in the
diagram. The incident solid black ray is the same in both cases.
a) At what angle from the vertical will the reflected beam (the red dashed arrow) now
10°
be seen?
b) If the mirror is further rotated until it is 20° from the horizontal, what will be the
new angle between the reflected beam and the vertical?
Transcribed Image Text:** 4. A beam of light travels vertically downward and strikes a horizontal mirror, reflecting directly back vertically upward, as indicated by the black dashed line in the diagram at left. The mirror is now rotated, so that it is 10° away from horizontal, as is the red mirror in the diagram. The incident solid black ray is the same in both cases. a) At what angle from the vertical will the reflected beam (the red dashed arrow) now 10° be seen? b) If the mirror is further rotated until it is 20° from the horizontal, what will be the new angle between the reflected beam and the vertical?
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