Read the following paragraph and answer the questions.

A compound microscope is an optical instrument used for observing highly magnified images of tiny objects. Magnifying power of a compound microscope is defined as the ratio of the angle subtended at the eye by the final image to the angle subtended at the eye by the object, when both the final image and the objects are situated at the least distance of distinct vision from the eye. It can be given that: m = m_e x m_o, where me is the magnification produced by the eye lens and m_o is the magnification produced by the objective lens.

(i)              When the length of a microscope tube increases, what is its magnifying power?

(ii)            How is the electron microscope superior to an optical microscope?

(iii)          If the focal length of the objective lens is increased, then what happens to magnifying power of microscope?

OR

(iii)       What does the resolving power of a microscope depends upon?