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A man uses spectacles, power 5D then calculate focal length. what is the vision defect?

what type of defect
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A man uses spectacles, power 5D then calculate focal length. what is the vision defect?


1 Answer


phys

5 = 1/f 

f =1/5 

f = 0.2 m

f = 20cm

The lens is convex lens so the defect is long sightedness. 

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