Difference between revisions of "AY Honors/Optics/Answer Key"

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(can it also be called epidioscope?)
 
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The '''opaque projector''','''epidioscope''', '''episcope''' or '''epidiascope''' is a predecessor to the [[overhead projector]]. It displays opaque materials by shining a bright lamp, often [[limelight]], onto the object from above. A system of mirrors, prisms and/or imaging [[Lens (optics)|lenses]] is used to focus an image of the material onto a viewing screen. Because they must project the reflected light, opaque projectors require brighter bulbs and larger lenses than overhead projectors. Care must be taken that the materials are not damaged by the heat generated by the light source. Opaque projectors are not as common as the modern "overhead".
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{{honor_header|2|1962|Health & Science<br>General Conference<br>2001 Edition}}
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==1. Define and/or draw a diagram of the following:==
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;a. Focal length :
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;b. Positive lens :
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;c. Negative lens :
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;d. Two kinds of distortion:
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;e. Longitudinal color:
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;f. Lateral color:
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;g. Spherical aberration:
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;h. Achromatic lens :
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;i. Refraction of light:
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==2. Explain how light behaves when it strikes or traverses water, oil, feldspar, and a mirror.==
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==3. Name and draw diagrams of three kinds of positive lenses and three kinds of negative lenses.==
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==4. What should be the minimum distance of light source from the lens when testing for focal length?==
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==5. Find the focal length of at least four lenses, one being a negative lens.==
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==6. Explain by diagram why an image from a positive lens makes an image reversed and inverted.==
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==7. Show with diagrams how a prism works. State the angles at which the colors appear and disappear.==
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==8. Show and demonstrate what happens when light strikes one-way glass.==
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==9. Construct one optical instrument using mirrors or lenses, such as a periscope, a slide or opaque projector, or a simple telescope.==
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==10. Explain what is meant by the term 6x35 and 7x50 as applied to binoculars.==
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==11. Define the term "f/stop" as used in connection with cameras. What does it mean when a lens is fast or slow? Is an f/8.5 lens faster or slower than an f/8 lens?==
  
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Suitable objects included book pages, drawings, mineral specimens, leaves, etc.  In the early and mid 20th century, opaque projectors were produced as low cost toy projectors for children, were also marketed as an artist's enlargement tool to allow images to be transferred to prepared canvas, or for lectures and discourses. 
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==References==
  
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==See also==
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[[Category:Adventist Youth Honors Answer Book]]
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* [[Projector]] for a directory of projector types.
 
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==External links==
 
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* [http://www.luikerwaal.com/newframe_uk.htm?/epidia_uk.htm Episcopes and epidiascopes], photographs of a collection.
 
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* [http://www.curzon.org.uk/collection/Epidiascope.html Historic Ross Epidiascope]
 
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* [http://adverlab.blogspot.com/2005/03/tools-epidiascope.html Brief description] of the modern [[Braun]] Paxiscope XL Epidiascope.
 
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* [http://www.firstcall-photographic.co.uk/pp/Projectors/35mm_Projectors_and_Epidiascopes/Braun_Paxiscope_XL_Epidiascope.html Another description] of the Braun Paxiscope unit.
 
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* [http://adverlab.blogspot.com/2005/06/epidiascope-strikes-back.html Digital epidiascope] from [[Samsung]].
 
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[[Category:Projectors]]
 

Revision as of 17:35, 30 October 2006

Template:Honor header

1. Define and/or draw a diagram of the following:

a. Focal length
b. Positive lens
c. Negative lens
d. Two kinds of distortion
e. Longitudinal color
f. Lateral color
g. Spherical aberration
h. Achromatic lens
i. Refraction of light

2. Explain how light behaves when it strikes or traverses water, oil, feldspar, and a mirror.

3. Name and draw diagrams of three kinds of positive lenses and three kinds of negative lenses.

4. What should be the minimum distance of light source from the lens when testing for focal length?

5. Find the focal length of at least four lenses, one being a negative lens.

6. Explain by diagram why an image from a positive lens makes an image reversed and inverted.

7. Show with diagrams how a prism works. State the angles at which the colors appear and disappear.

8. Show and demonstrate what happens when light strikes one-way glass.

9. Construct one optical instrument using mirrors or lenses, such as a periscope, a slide or opaque projector, or a simple telescope.

10. Explain what is meant by the term 6x35 and 7x50 as applied to binoculars.

11. Define the term "f/stop" as used in connection with cameras. What does it mean when a lens is fast or slow? Is an f/8.5 lens faster or slower than an f/8 lens?

References

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