1. Diffraction of Light
Austen Corbitt and Lindsey
Stanfield

2. Objectives
❖Describe how light waves bend around
obstacles and produce bright and dark
fringes.
❖Describe how diffraction determines an
optical instrument’s ability to resolve
images.

3. Introduction
● In this presentation, we will be introducing:
✓Key Terms
✓How it works
✓How Light Bends Around Obstacles
✓Production of Dark and Light Fringes
✓ Resolving Images

4. Key Terms
•
•
•
•
Diffraction - a change in light wave direction
as they pass from one medium to another.
Aperture - a small slit in which light travels
Minima - the dark regions of the diffraction
pattern.
Prima Maxima - bright central region of the
diffraction pattern.

5. What is Diffraction?
•
•
Diffraction is when light passes through an
object because of the slits or holes in
it, causing it to produce a light on the other
side of that object.
There are many different ways diffraction
occurs: Light, sound, water, etc.

6. How Stuff Works
This is the maxima
This is the minima

7. How Light Bends Around an Object
❖Light bends around an object by
diffraction, obviously; but what does that
mean?
❖When an object interferes with the passage
of light, the waves will pass through a slit in
a objects. Then they will spread out in a
certain way on the other side of the object.

8. Examples
❖ Slit size equal to wavelength
wavelength
Slit size 5x the

9. Resolving Images
•
•
•
Most people didn’t know that diffraction is
also occurs in the resolution of images.
When a camera lens is used, diffraction
occurs when light passes through the
camera’s aperture, causing the picture to be
disoriented or unresolved.
The camera has a certain feature that
corrects the disoriented picture.

10. This picture is what is expected to
come out when a camera takes a
picture.
This picture is the result when the
resolution is disoriented because of
diffraction.

11. Cited Page
●
web.utk.edu. (n.d.). web.utk.edu. Retrieved October 28, 2013, from http://web.utk.edu/
●
Davidson, M. W. (1998, June 20). Molecular Expressions Microscopy Primer: Light and Color - Diffraction of
Light: Interactive Java Tutorial. Molecular Expressions Microscopy Primer: Light and Color - Diffraction of Light:
Interactive Java Tutorial. Retrieved October 28, 2013, from http://micro.magnet.fsu.edu/primer/java/diffra
●
McHugh, S. (n.d.). LENS DIFFRACTION & PHOTOGRAPHY. Diffraction Limited Photography: Pixel Size, Aperture
and Airy Disks. Retrieved October 28, 2013, from http://www.cambridgeincolour.com/tutorials/diffractionphotography.htm
●
Reichmann,, M., Raber, K., & Sanderson, C. (n.d.). Luminous-Landscape Copyright.Luminous-Landscape
Copyright. Retrieved October 26, 2013, from http://www.luminous-landscape.com/about/luminous_landscape