The least distance of distinct vision is $25 \ cm$. Find the magnifying power of a simple microscope of focal length $5 \ cm$ if the final image is formed at the least distance of distinct vision.

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 . . . . . . .

How should people wearing spectacles work with a microscope?

$A$ scientist is observing a bacteria through a compound microscope. For better analysis and to improve its resolving power,he should: (Select the best option)

Explain the difference between the functions of a telescope and a microscope.

The focal lengths of the objective and the eyepiece of a compound microscope are $2 \,cm$ and $3 \,cm$ respectively, and the distance between them is $15 \,cm$. The final image formed by the eyepiece is at infinity. The distances of the object and the image produced by the objective lens from the objective lens are respectively: