# Refraction of a wave

Refraction is the change in the direction of a wave due to a change in its transmission medium. The above diagram shows this phenomenon schematically, where a monochromatic light with wavelength $$\lambda$$ is passing from medium I to medium II. At the boundary surface between the two mediums, some portion of the light is reflected and the rest is refracted with $$45^\circ$$ refraction angle. Which of the following statements is NOT correct?

a) The reflection angle $$\theta$$ is $$30^\circ.$$
b) The frequency of the monochromatic light in medium I is greater than that in medium II.
c) The speed of the monochromatic light in medium I is faster than that in medium II.

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