[" A person needs a lens of power - "5.5" dioptres for correcting his distant viston.For "],[" correcting his near vision he need a lens of bower "+1.5" dioptre.What is the focal "],[" length of the lens required for correcting (i) distant vision,and (fii) near vision? "],[" The far point of a myopic person is "80cm" in front of the eye.What is the nature and "]