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# 4.2 optics

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### 4.2 optics

1. 1. Write the statement. If it is true leave it alone, if it is false change it to make it true. Optics is the study of all forms of light and tools that use light. A flat mirror produces an upside-down image. The angle formed by light striking a mirror is always less than the angle of reflection.
2. 2.  Refraction is the bending of light that takes place at a boundary between two mediums. Refraction is caused by a change in the speed of light as it passes from one medium to another.
3. 3.  Rainbows are caused by refraction.  The raindrops act like a prism and refract light, then reflect light off each other.
4. 4. A lens is a clear optical tool that refracts light.  Different types of lenses refract light in different ways
5. 5.  Parallellight rays pass through the lens and are refracted outward.  Light rays closest to the edges are refracted the most.  Light rays that pass through the center are not refracted at all because they pass through at the focal point
6. 6.  Parallel light rays that pass through a concave lens are refracted outward  Light rays closest to the edges are refracted the most.  Light rays that pass through the center are not refracted  Light ray are deflected away from each other and do not meet
7. 7.  Focallength- the distance from the center of the lens to the lens’s focal length.