How should people wearing spectacles work with a microscope?

What are the objective and the eye-piece in an optical instrument?

$A$ compound microscope consists of an objective lens of focal length $2.0 \, cm$ and an eyepiece of focal length $6.25 \, cm$ separated by a distance of $15 \, cm$. What is the magnifying power when the final image is formed at the least distance of distinct vision $(25 \, cm)$?

If in a compound microscope,the objective has a focal length of $1.0 \text{ cm}$,the eyepiece has a focal length of $2.0 \text{ cm}$,the tube length is $20 \text{ cm}$,and the near point for an observer is $25 \text{ cm}$,then the value of the magnification of the compound microscope will be . . . . . . .

$A$ compound microscope has an eyepiece of focal length $10 \, cm$ and an objective of focal length $4 \, cm$. Calculate the magnification,if an object is kept at a distance of $5 \, cm$ from the objective so that the final image is formed at the least distance of distinct vision $(20 \, cm)$.

$A$ microscope has an objective of focal length $1.5\, cm$ and an eye-piece of focal length $2.5\, cm$. If the distance between objective and eye-piece is $25\, cm$,the approximate value of magnification produced for a relaxed eye is?