Final answer:
A prism causes dispersion of white light into a continuous spectrum of colors, and a blue filter allows blue light to pass through by reflecting it.
Step-by-step explanation:
When white light passes through a prism, it breaks up into the color spectrum. This phenomenon is called dispersion and is due to the fact that different frequencies of light have different refractive indices. As a result, when white light enters the prism, it is refracted (bent) by different amounts for each color, causing them to spread out and form a continuous spectrum of colors, from violet to red. This action is similar to how a rainbow is created by dispersion of light through raindrops.
As per the GRASP CHECK question, the correct answer is:
Explain why only light from a blue bulb passes through the blue filter.
b. A blue filter reflects blue light.