Light

What is Snell's law? answern = c/v = sin i/sin rby extension, n1sini = n2sinr, orn2/n1 = sin i/sin r	What is the equation for the critical angle? answersin critical angle = 1/n
What is the thin lens equation? answer1/f = 1/u + 1/vApplies to curved mirrors as well.	What is lens power? answer1/fwhere f is the focal length in m.Lens power is measured in diopters.
What is the focal length of two lenses in contact? answer1/F = 1/f1 + 1/f2	What is the equation for the energy of a photon? answerE = hfwhere h is Planck's constant and f is frequency.