Q3- The optical prescription for the pair of spectacles is :
Right eye: -3.5D and Left eye: -4.00D
a- Are these lenses thinner at the middle or at the edges?
b- Which lens has a greater focal length?
c- Which is the weaker eye?
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Q3- The optical prescription for the pair of spectacles is :
Right eye: -3.5D and Left eye: -4.00D
a- Are these lenses thinner at the middle or at the edges?
b- Which lens has a greater focal length?
c- Which is the weaker eye?
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A clock is a device used to measure, keep, and indicate time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units: the day, the lunar month, and the year. ... Water clocks, along with the sundials, are possibly the oldest time-measuring instruments.
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