When a parallel beam of light enters water surface obliquely at some angle, what is the effect on the width of the beam?
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Solution and Explanation
When a parallel beam of light enters a denser medium like water obliquely, the light slows down due to the higher refractive index of water compared to air. According to Snell’s law, the angle of refraction is smaller than the angle of incidence. This leads to a reduction in the width of the beam as it enters the water.
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