When a wooden stick is partly submerged obliquely in water, it appears to be bent at a point where it enters the water surface due to refraction of light.
The correct answer to the question is:
Option D. Refraction of light due to differences in speed of light in air.
Refraction results from the change in the speed of a wave when it passes from one medium to another.
The refraction of light wave is affected by two main factor. These are:
1. The angle of incidence ray. The angle to which light ray enters a medium will definitely determine how much the ray will be refracted.
2. The change in the speed of the wave. What ever tends to change the speed of a wave will definitely cause the wave to refract.
With the above information in mind, we can conclude that a wooden stick partly submerged in water appears to be bent at a point where it enters the water due to refraction since the mediums are different i.e air to water.
Thus, the correct answer to the question is:
Option D. Refraction of light due to differences in speed of light in air.
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