Question

A person need a lens of power -5.5D
For correcting his distant vision. For
correcting his near vision hr needs a
lens
of power +1.5D calculate the focal length of the lens used in these two cases

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Answer 1

Answer:

1st case:-

P=-5.5D

f=1/P

=1/-5.5

=-0.1818m

2nd case:-

P=1.5D

f=1/P

=1/1.5

=0.666m

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