If the focal length of objective and eye lens are `1.2 cm` and `3 cm` respectively and the object is put `1.25cm` away from the objective lens and the final image is formed at infinity. The magnifying power of the microscope is

For a compound microscope, the focal length of eyepiece and objective lens is 5 cm and 1 cm, respectively. The length of the tube is 30 cm. If the final image is formed at infinity, calculate the magnifying power of the microscope.

The focal length of objective and the eyepiece of a compound microscope are 1cm and 5cm. An object is placed at a distance of 1.1 cm from the objective and if the final image is formed at infinity the magnifying power and distance between the lenses are respectively