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Which of the following lenses would you prefer while reading small letters in a dictionary?
(a) A convex lens with focal length of 50 cm
(b) A concave lens with focal length of 50 cm
(c) A convex lens with focal length of 5 cm
(d) A concave lens with focal length of 5 cm
c) A convex lens with focal length of 5 cm
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