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