A person needs lens of power -6d for correcting his distinct visjon
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So, he is using concave lens.
1/f=-6d
=>f=1/6 m
=>f=100/6 cm
=>f=16.66 cm or 16 2/3 cm,
1/f=-6d
=>f=1/6 m
=>f=100/6 cm
=>f=16.66 cm or 16 2/3 cm,
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