Holography Review Questions
Name 3 features of a laser that are necessary to the production of a hologram.
1. laser light is monochromatic, means that it consists of only one wavelength of light. 2. Laser light is coherent, meaning that all of the light waves are in phase with each other. 3. Laser light can be very bright, allowing for relatively short exposure times.
Why must the hologram be made in an absolutely vibration-free environment?
A hologram consists of an interference pattern. Since the wavelength of light is very, very small, even tiny vibrations will destroy the interference pattern.
What is the difference between a hologram and a holograph?
A hologram is a 3-D image produced with a laser. A holograph is a document written entirely in the hand of its author.
Scratches that are made with large-radius arcs appear to be ___ the viewer, while scratches that are made with small-radius arcs appear to be ___ the viewer.
Far from; close to
Two light sources interfere to make the hologram. What are they?
One light sources is light from the laser and the other is the laser light reflecting off of the object.
When you move your head from side to side, objects that are at different distances from you shirt their relative position with respect to each other. What word is used to refer to this shifting?
Parallax
Describe how you can make a line that appears to recede from the viewer.
Start by making scratches with a small radius and gradually increase the radius as you make subsequent scratches.
If you hold your hologram up to a light it will appear as a featureless fogged piece of glass. How is the hologram best viewed?
The hologram is best viewed by reflecting light from a small point-source of light.
How is the image of a hologram stored in the film?
The image is stored as an interference pattern.
What kind of light source is best for viewing your scratch hologram?
The scratch hologram is best viewed under light from a small point-source of light.
How do the light scratches in plastic produce the dots that make up the image of your scratch holograms?
The scratches act like small curved mirrors.