1) Use Boltzmann distribution to mathematically show that a two level laser system is not possible. Calculate the ratio of number of molecules per state at the room temperature.
2) A magnifying glass with a focal length 5 mm is used to view a bug by a person whoâ€TMs smallest distance of distinct vision is 25 cm. If this person holds this magnifying glass close to his/her eye, what is the best position of the object?
3) Supposedly we designed a compound microscopic imaging system that has an objective producing lateral magnification of 40x. What focal length eyepiece will produce an overall magnification of 200x?