Which of the following lenses would you prefer to use while reading small letters found in a dictionary?

The magnification produced by a plane mirror is $+1$. What does this mean?

We wish to obtain an erect image of an object,using a concave mirror of focal length $15\, cm$. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.

An object $5 \,cm$ in length is held $25 \,cm$ away from a converging lens of focal length $10 \,cm$. Find the position,size,and the nature of the image formed.

An object of size $7.0\, cm$ is placed at $27\, cm$ in front of a concave mirror of focal length $18\, cm$. At what distance from the mirror should a screen be placed,so that a sharp focussed image can be obtained? Find the size and the nature of the image.

Name the mirror that can give an erect and enlarged image of an object.