To read small letters in a dictionary one can use a [[1]] lens of smaller focal length.

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Detailed Solution

To read small letters in a dictionary one can use a convex lens of a smaller focal length.
The object or, in this case, the dictionary will be kept between focal length and the convex lens so that a virtual, erect and magnified image is formed. And for a lens for an image of larger magnification, the focal length should be small. Thus, convex lenses are used in microscopes and magnifying glasses.

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