Download presentation
Presentation is loading. Please wait.
Published byBret Bagnell Modified over 9 years ago
1
Instead of shining monochromatic light (e.g. a laser) through a diffraction grating, what would happen if we shone a polychromatic light source (e.g. white light)? Do now:Wenerei, 29 Paenga-whāwhā 2015
2
Diffraction Gratings If we shine white light onto a grating, we produce a series of spectra each side of the central fringe This is because white light is made of many frequencies (colours) which all diffract at slightly different angles White n=0 violet red n=1 n=2 Diffraction Grating
3
Diffraction vs Refraction
4
The spectrum produced by a grating is more widely spread that that produced by a prism It is also the other way around (i.e. red is diffracted the most) – why? Red light has the longest wavelength, so is closest to the slit spacing, so diffracts the most Violet has the highest frequency, so interacts more when passing through a media, so slows down more (higher refractive index), so refracts more
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.