Use Huygen\'s principle to show how a plane wavefront propagates from a denser to rarer medium.
Use Huygen\'s principle to show how a plane wavefront propagates from a denser to rarer medium. Hence verift snell\'s law of refreaction.
Use Huygen\'s principle to show how a plane wavefront propagates from a denser to rarer medium. Hence verift snell\'s law of refreaction.
