A glass plate 3.45 mm thick, with an index of refraction of 1.60, is placed between a point source of light with wavelength 500 nm (in vacuum) and a screen. The distance from source to screen is 2.05 cm. How many wavelengths are there between the source and the screen?

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c. m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?