A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results in: 

(a) a larger angle to be subtended by the object at the eye and hence, viewed in greater detail.
(b) the formation of a virtual erect image.
(c) increase in the field of view.
(d) infinite magnification at the near point.

1. (a, b)
2. (a, c)
3. (b, d)
4. (c, d)

(1) Hint: Magnification of the object takes place.

A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results in a larger angle to be subtended by the object at the eye and hence, viewed in greater detail. Morever, the formation of a virtual, erect and enlarged image takes place.