Hold the paper above and in front of the mirror. Adjust the positions of the paper and mirror until the reflected light shines on the paper. Observe the colored spectrum. The different colors of light are affected differently. Violet light slows the most, and bends the most.
Red light slows and bends the least.
Take the glass and flashlight into a darkened room. Hold the flashlight above the surface of the water and observe the water in the glass from the side. It should have a slight bluish tint. Now, hold the flashlight to the side of the glass and look through the water directly at the light. The water should have a slightly reddish tint.