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| 1. |
A person uses a pens of power -2.0D for correcting his distant vision. For correcting his vision he uses lens of power +1.5D. What is the focal length of lens required to correct this disorder? |
| Answer» USES a lens of power p = -2.0Dfocal LENGTH required F = 1/-2.0 *100 = -50cmPerson uses a lens of power p = +1.5Dfocal length f = 1/+1.5 * 100 = +66CM | |