Light and Electricity

action angle appear attraction axis bands battery beam blue body bright called caused centre charged circuit coil colors combination conductor connected core crystal dark direction discharge distance double earth effect electric electro-magnet employed enters equal ether example experiments fact fall flame focus force formed glass greater heat Hence hydrogen illuminated inch incidence intensity iron length lens less light lines liquid luminous magnetic matter means metals mirror motion moves needle Note object oblique observed obtained opposite optic ordinary parallel particles passes perpendicular phenomena placed plane plate platinum polarized poles portion positive primary principal prism produce rays reaches reflected refraction rendered retardation retina rings rotation round screen secondary seen shadow side single slit space spar spark spectrum square strength substance surface theory thickness tion transmitted turn vibration voltaic waves wire zinc