Refraction problem

answer in nm - A proton is located at a distance of 0.410 m from a point charge of +8.30 µC. The repulsive electric force moves the proton until it is at a distance of 1.56 m from the charge. Suppose that the electric potential energy lost by the system is carried off by a photon that is emitted during the process. What is its wavelength?

Magnetic Field - A 1140nF capacitor with circular parallel plates 1.12cm in diameter is accumulating charge at the rate of 20.7mC/s at some instant in time. What will be the induced magnetic field strength 10.8cm radially outward from the center of the plates? What will be the value of the field strength after the capacitor is fully charged?

How to find the angle of incidence. - A person stands .038 cm in front of a wall that is covered floor to ceiling with a plane mirror. His eyes are .019 cm above the floor. He holds a flashlight between hi feet and manages to point it at the mirror. At what angle of incidence must the light strike the mirror so the light reaches his eyes?

Grating - When a grating is used with light that has a wavelength of 621 nm, a third-order maximum is formed at an angle of 18.0°. How many lines per centimeter does this grating have? answer in lines/cm

Diffraction-Rayleigh criterion - Late one night on a highway, a car speeds by you and fades into the distance. Under these conditions the pupils of your eyes (average refractive index = 1.36) have diameters of about 7.0 mm. The taillights of this car are separated by a distance of 1.4 m and emit red light (wavelength = 660 nm in vacuum). How far away from you is this car when its taillights appea...