1. The pupil of the eye is a black object or spot on the surface of the eye.
2. The eye receives upright images.
3. The lens is the only part of the eye responsible for focusing light.
4. The lens forms and image (picture) on the retina. The brain then "looks" at this image and that is how we see.
5. The eye is the only organ for sight; the brain is only for thinking.
6. A white light source, such as an incandescent or fluorescent bulb, produces light made up of only one color.
7. Sunlight is different from other sources of light because it contains no color.
8. When white light passes through a prism, color is added to the light.
9. The rules for mixing color paints and crayons are the same as the rules for mixing colored lights.
10. The primary colors for mixing colored lights are red, blue and yellow.
11. A colored light striking an object produces a shadow behind it that is the same color as the light. For example, when red light strikes an object, a red shadow is formed.
12. The shades of gray in a black and white newspaper picture are produced by using inks with different shades of gray.