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15 Cards in this Set
- Front
- Back
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What are prisms used for?
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-Dispersion in spectroscopy (generally with large angle prisms)
-Chromatic aberration (generally with large angle prisms) -Beam splitter (generally with large angle prisms) -Correction of heterophorias (generally with small angle prisms) |
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Name the parts of a prism?
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-base - many times unpolished
-Apex - where the apical angle is -refracting faces |
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At what angle is a prism determined to be a large angle prism?
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Generally an angle greater than 10 degrees
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What is the basic formula for calculating the apical angle?
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a = i1’ + i2
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What is the basic formula for calculating the deviation of an angle in a prism?
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d = i1 + i2’ - a
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What is the formula for the minimum angle of deviation?
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np = sin ½(a+dmin)
ns sin ½a |
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What is another formula to calculate the deviation angle for a small angle prism?
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d = (np – 1)a
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How does a small angle prism change the way an image appears to the viewer?
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“Bends towards base” “Appears towards apex”
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What are the 2 formulas for calculating prism diopter?
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P△ = 100 tan d⁰
P△ = displacement (cm) / distance (m) |
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Name this prism.
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Rhomboidal
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Name this prism
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Leman or Sprenger prism
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Name this prism
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Penta prism
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How does a penta prism work?
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-Penta prism can deviate an incident beam without inverting or reversing to 90°
-Uses mirroring and not refractive index angles to cause internal refraction --commonly used in Plumb Level, Surveying, Alignment, Rangefinding and Optical Tooling |
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What does a Porro prism do?
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Right angle prism is deviating or deflecting a beam of light with 90 or 180° .
---often used in telescope, periscope and other optical system. |
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Name this prism
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Dove prism
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