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4) In the late 17th century, Newton and Huygens had a famous disagreement about the nature of light. Newton thought is was comprised of particles that were pulled into the glass as they passed across a boundary with air, while Huygens thought light was a wave that slows down as it passes into glass. Both pictures can correctly account for the angle of refraction. a) What observation could decide between these pictures? (The technology did not exist to make this observation in the late 17th century, so do not worry about what technology is needed to make the observation.) b) Knowing what you do today, if you could be a fly whispering in Newton's and Huygen's ear at the time of that debate, and you could only tell them one sentence to help them understand the extent to which they were either right or wrong, what would that sentence be