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COA Exam Prep Questions with Answers 2024/2025
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COA Exam Prep Questions with Answers 2024/2025
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COA Exam Prep Questions withAnswers 2024/2025
Astigmatic Clock - -Multiply lower number by 30 to determine approximate axis of astigmatism -Chord Length - -distance between two points at the edge of the reflected mire of surface being measured -"Against" -the-rule Astigmatism - -Corrected by plus cylinders at 180 degrees (horizontally) -"With"-the-rule Astigmatism - -Corrected by plus cylinders at 90 degrees (vertically) -white light - -combination of all colors - "Sir Isaac Newton" -Divergence - -Rays of light from any luminous point will "spread out" or "DIVERGE" -Prism - -Triangular piece of glass/plastic with an apex and a base -Convex Lens - -1. 2 prisms- Base to Base
2. Converges Light
3. Bends light rays to a shorter focus behind the retina
4. Plus lenses (hyperopia) -Convergence - -When a bundle of rays is brought together -Concave Lenses - -1. 2 prisms- Apex to Apex
2. Diverges Light
3. Bends light rays to focus in front of retina
4. Minus Lenses (myopia) -Fiberoptic Bundle - -transparent core of material with a high refractive index.
light moves along theses cores.
total internal reflection occurs when light moves from higher index to lower index producing intense concentrated light at end of tubing -Spherocylinder Lenses - -combination of spherical power and cylindric power/axis
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