Starting from the fermat’s principle derive an equation for a shape of an air-glass interface which collimate the rays from a point s0on the optical axis in air parallel to the optical axis in glass (ng=1.5).

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.