A narrow beam of light is incident normally upon a thin slit, and the light that passes through is spread out by diffraction. The thin slit is then immersed in a container of water. The beam of light is shone through the water and is again at normal incidence to the slit. The spread of the diffracted beam of light in water will be
[Figure: Diagram showing light beam diffracting through slit in water container]
A. The same as in air
B. Diffraction will not occur in water
C. Less spread out than in air
D. More spread out than in air