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6) what power for spectacles should a person with a prescription of -2.5D for contacts use...

6) what power for spectacles should a person with a prescription of -2.5D for contacts use if the spectacles are to be worm 2cm from the eye?

a) -1.923D
b) -2.632D
c) -2.381D
d) -3.333D
e) -1.429D
Science   Advanced-Physics   
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