Doctor advised to use 3D lens .The power of the lens?
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P = 1/ f
3 = 1/ f
f = 1/3
f = 0.3 m
f = 0.3 * 100
f = 30 cm
3 = 1/ f
f = 1/3
f = 0.3 m
f = 0.3 * 100
f = 30 cm
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