Repeat Question 7 using a 2-foot by 4-foot fluorescent light box in place of the incandescent bulb.
Reference of question 7
You are in a dark room with a single incandescent 60-watt bulb in the center of the ceiling. You hold a book directly beneath the bulb and begin lowering it toward the floor. As the book is lowered, what happens to the size of the umbra?
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