MAHARASHTRA STATE BOARD CLASS XI AND XII PHYSICS CHAPTER 7 WAVE OPTICS CONTENT: Huygen's principle. Huygen's principles & proof of laws of reflection/refraction. Condition for construction & destruction of coherent waves. Young's double slit experiment. Modified Young's double slit experiment. Intensity of light in Y.D.S.E. Diffraction due to single slit. Polarisation & doppler effect.