ABO NOCE Practice Test

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Which prism combination will cancel a prism effect?

BU/BU
BD/BD
BI/BO
BI/BI

The correct answer is: BU/BU

The combination that effectively cancels a prism effect involves using prisms that have equal but opposite orientations. In this case, "BU/BU," which indicates base up prisms placed together, will effectively neutralize their impact. When two prisms with the same orientation are combined, their effects cancel each other out because they direct light in the same manner. Prism optics work on the principle that the base direction of the prism influences how light is bent. Therefore, by positioning two prisms with the same base direction together (such as base up), the light is bent by equal amounts in both instances, resulting in overall no deviation of light. Other combinations either reinforce the prism effect or do not provide the desired cancellation. This understanding of prism orientation and its effects is crucial for opticians when assessing and correcting vision issues through compensatory prism placement.