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Answer :
Final answer:
The equivalent of a Reduced Snellen 20/50 optotype in metric notation, given a working distance of 40cm, is 1M. This represents a comparison of the student's vision to 'normal' vision.
Explanation:
The equivalent of a Reduced Snellen 20/50 optotype in metric notation, assuming a working distance of 40cm, is 1M. The Snellen chart measures visual acuity, or how well one can see. The numbers represent a comparison between the respondent's vision and 'normal' vision. In this case, a rating of 20/50 indicates that what the person can read at 20 feet (or in this case, its metric equivalent at 40cm), someone with 'normal' vision could read at 50 feet. This is converted into metric notation as 1M, similar to how a person with 'normal' vision can read at 1.00 m.
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