ToExplain: The height of shadow after the removal of plastic with clear and neat labeled ray diagram

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Chapter 24.4, Problem 2TH

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ToExplain:The height of shadow after the removal of plastic with clear and neat labeled ray diagram

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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 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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