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10 Question-answer on human eye and camera 1.        Near and far points of a healthy human eye respectively are (a)     0 and 25 cm (b)    0 and infinity (c)     25 cm and 100 cm (d)    25 cm and infinity Ans: (d) 2.        A person suffering from presbyopia should use (a)     A concave lens (b)    Convex lens (c)     A bifocal lens whose lower portion is convex (d)    A bifocal lens whose upper portion is convex Ans: (c) 3.        The focal length of concave lens required to correct myopia is: (a)     Less than the distance of far point from the eye (b)    Equal to the distance of far point from the eye (c)     Equal to 25 cms (d)    Equal to 125 cms Ans: (b) 4.        A defect of vis...