Question:
When a parallel beam of light enters water surface obliquely at some angle, what is the effect on the width of the beam?
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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The width of a light beam reduces when it enters a denser medium at an oblique angle due to the refraction of light.
Updated On: Feb 26, 2025
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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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