Simple Compound Microscope

A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness 3 cm and a refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again?

1. 1 cm upward

2. 4.5 cm downward

3. 1 cm downward

4. 2 cm upward

A microscope has an objective of focal length eyepiece of focal length and the tube length of If the distance of distinct vision of eye is the magnification in the microscope is:
1.
2.
3.
4.