1.

A laser which has a wavelength of 800 nm is directed into a Michelson interferometer. If we see 18 interference fringes scroll by moving one of the mirrors of the interferometer in a given direction, what is the distance which now separates this mirror from its initial position in [nm]?

2.

Consider the same lens system as in the previous question except that the focal length of the second lens l2 is f2 = 14 cm and the height of the object is h = 0.02 cm. What is the angular magnification of this device G = / where is the angle of observation through the optical device and is the maximum angle of observation with the naked eye (considering that an eye can image an object at a minimum distance of 25 cm)