1.

a person needs a lens of power of -5.5diopters for correcting his distant vision. For correcting is near vision he needs a lens of power + 1.5 diopter what is the focal length of the lens required for correcting distant vision

Answer»

GIVEN power of lens for corecting DISTANT vision is -5.5D

relation between power and focal LENGTH is P=1/f (or)  f=1/P

f=1/5.5    f=0.1818m

(or) f=18.18cm


So the focal length REQUIRED to correct the distant vision is 18.18cm.




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