[" 15.) A person needs a lens of power "-5.5" dioptres for correcting his distant vision.For "],[" correcting his near vision he needs a lens of power "+1.5" dioptre.What is the focal "],[" length of the lens required for correcting (i) distant vision,and (ii) near vision? "],[" (6.) The far point of a myopic person is "80cm" in front of the eye.What is the nature and "],[" power of the leng "]