State the laws of reflection of light

What is the fate of the electrons that interact with a specimen in an electron microscope?

What is the final velocity of the initial velocity of 25 and -50?

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?