Two convex lenses having focal length of and are placed coaxially to form a compound microscope…

Two convex lenses having focal length of $1.5\text{ cm}$ and $5\text{ cm}$ are placed coaxially to form a compound microscope. When a pin is kept at a distance of $1.6\text{ cm}$ from the objective lens, a virtual magnified image is formed at a distance of $25\text{ cm}$ from the eyepiece. Calculate the length of the microscope.