Final answer:
The most accurate statement about the behavior of light entering a piece of transparent glass is that the light slows down and its wavelength decreases; the color remains unchanged while the frequency remains constant.
Step-by-step explanation:
When a ray of light travels from air into a piece of transparent glass, the behavior of light involves a change in both speed and wavelength. Specifically, the speed of light decreases when it enters the glass because glass is a denser medium than air. Additionally, the wavelength of light also decreases, which is indicative of light slowing down. The color of the light does not change; instead, it is the frequency of the light that remains constant as light transitions from one medium to another, while its speed and wavelength are affected.
Therefore, statement a) that 'Jenny is correct; the ray of blue light will slow down in the glass' is the most accurate regarding the behavior of light when it enters a piece of transparent glass. This slowing down of light leads to its change in direction, a phenomenon known as refraction, which alters the light ray's path but not its inherent color.