U 13.5 L4 Lens Diagram Worksheet.pdf (application/pdf Object) Polar bear refraction.jpg. Hewitt Blue Sky. Blue Sky/Red Sunset. Blue Sky - Why is the Sky Blue? On a clear sunny day, the sky above us looks bright blue. In the evening, the sunset puts on a brilliant show of reds, pinks and oranges. Why is the sky blue? What makes the sunset red? To answer these questions, we must learn about light, and the Earth's atmosphere. MIT used parts of this article in their online class! The Atmosphere The atmosphere is the mixture of gas molecules and other materials surrounding the earth. The composition of the atmosphere varies, depending on your location, the weather, and many other things.
The atmosphere is densest (thickest) at the bottom, near the Earth. Light Waves Light is a kind of energy that radiates, or travels, in waves. Electromagnetic Waves It is one small part of a larger range of vibrating electromagnetic fields. Electromagnetic waves travel through space at 299,792 km/sec (186,282 miles/sec). The energy of the radiation depends on its wavelength and frequency. Colors of Light The spectrum is also visible when you see a rainbow in the sky. Refraction and Lenses. Snells Law Worksheet. Plane mirror reflection. Curved Mirror Ray Diagrams.