Wave Optics
Two torches never make stripes on a wall, yet a single light and two narrow slits do. Light is a wave, and waves add up, spread round edges and can be polarised. This chapter follows Huygens' wavefronts to the laws of reflection and refraction, Young's fringes, diffraction at a slit and a grating, the limit of what a telescope can see, polarisation and thin films. It serves the Indian syllabus (NCERT, JEE Main, NEET) and the wave optics of A-Level, IB and AP Physics.
Part of Physics · High School (11–12) (chapter 24)
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Wavefronts, Interference and Young's Experiment
Why a ripple spreads in a circle, and why two ripples make a pattern. Huygens' principle and the laws of reflection and refraction, then coherent sources and the interference of two waves, and Young's double slit with its fringe width. It serves the Indian syllabus (NCERT, JEE Main, NEET) and the matching topic of A-Level, IB and AP.
Diffraction, Gratings and Resolving Power
Light bends round a narrow slit and spreads. We study the single slit and the width of its central maximum, then the double slit and the grating with diffraction included. The Rayleigh limit decides what a telescope, a microscope or an eye can tell apart. It serves the Indian syllabus (NCERT, JEE Main) and the matching topic of A-Level, IB and AP.