demo19 - Demonstration for Class 19 - Nature of Light and...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Demonstration for Class 19 -- Nature of Light and Interference You've all seen the rainbow-like spectrum created by white light through a prism. The colors spread out because the shorter wavelengths -- the blues --- are bent more than the longer wavelengths as they pass or refract through the prism. But why is light bent when it enters a higher index material at an angle? Due to the higher index of refraction, the speed of light is less in glass, say, than it is in air. The frequency is always the same no matter what the medium, so it's the wavelength that shortens in a higher index material. To show you the prism effect, I used a "carbon arc lamp". This is a device for producing intense white light by striking a high voltage electric spark between the tips of two carbon rods. Carbon arc lamps pre-date Thomas Edison's first electric light, and were a motivation for Edison to create something cleaner and safer to use. Movie theaters used carbon arc projection lamps up until recently, and the expression "in the limelight"
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

demo19 - Demonstration for Class 19 - Nature of Light and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online