Which image best illustrates diffraction? A. A picture of a few clouds covering the sun and streams of light coming through the clouds.
B. A photo of a water lily floating on the water.
C. A picture of a straw in a glass of water showing the shift in position of the straw due to the water.
D. A picture of a rainbow.

C

Explanation:

When light transitions from the air to the water the light bends due to refraction. The refractive index is related to the speed of light in both air and water. The Wikipedia article on Refraction does and excellent job of explaining this.

The correct option is C. A picture of a straw in a glass of water showing the shift in position of the straw due to the water.

Explanation:

Hope this helps you. Have a nice day ahead( ; ^_^

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