Unit 10 Blog Post #2

Today in class, we kept reviewing unit 10. Mr. Blake told us that the reason we can see things because of light. For example, Mr. Blake's shirt was red. When the light hits his shirt, it absorbs all the colors except for red. That red not absorbed reflects off his shirt and to our eyes so we can see his red shirt. Mr. Blake talked about the light in our classroom. In the classroom, the lights shine white lights. White lights shine all the colors. Something fun that we learned is why the sky is blue. The sky is blue because the scattering of the blue wavelengths due to the nitrogen in our atmosphere.  Another fun thing we learned was about the color of ocean. Water likes to absorb lower frequency lights like red, but water is actually clear. Since water is clear and absorbs lower frequency lights, the blue and other colors with higher frequencies get shown. The next item we went over was the Law of Reflection. All angles are relative to the normal. In equation form, angle of incidence equals angle of reflection. We talked about different reflections. When the surface the light is reflecting on flat, then the reflection will be a specular reflection. An example of this is reflecting light from a mirror. You can tell it is flat because the if using a laser pointer then reflections leaves a dot of light. If the surface the light is reflecting on is no flat, then the reflection is a diffuse reflection. An example of this is reflecting light from the Punahou white board. When reflecting a laser pointer light off it, the pointer leaves a wider line reflections.

This is a picture of the sky. We learned about how the sky is blue because of the scattering of the blue wavelengths due to the nitrogen in our atmosphere. This is involving the lights that we talked about in class.