Question

Q.1) A person needs a lens of power -5.5 D for correcting his distinct vision .For correcting near vision he needs lens of power +1.5D. FIND:
Focal length of lens required for (1.) distant vision (2.) For near vision?

Answer 1

1) power= -5.5 D

p=1/f

- 5.5 = 1/f

f = -5.5 m

2) power= 1.5D

p= 1/f

1.5 = 1/f

f = 1.5 m

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