What two things must occur in order for a light ray to refract when it strikes the boundary of a different medium?
A. It must strike the boundary at an angle, and its speed must
change.
B. It must strike the boundary at 45°, and its wavelength must
change.
C. It must strike the boundary at an angle, and its frequency must
change.
D. It must strike the boundary at 45°, and its frequency must change.

When light passes from one transparent medium to another, the rays are bent toward the surface normal if the speed of light is smaller in the second medium than in the first. The rays are bent away from this normal if the speed of light in the second medium is greater than in the first.

Explanation:

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every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.