Dee says that she has developed special sunglasses to enable people to see light with wavelengths of 550 to 700 nanometers. Would these be useful for humans?
A. No-these frequencies are already visible to humans.
B. Yes-but only for seeing very faint lights.
C. No-unless one is looking at very bright lights.
D. Yes-these frequencies are normally outside of human range.
Answer: A
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