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absorbed absorption spectroscopy absorption spectrum accuracy acid aluminium angle aperture applied arc method band barium beam of light Beer's Law boron caesium calcium Carbonate cell cent solutions collimating collimating lens colour composition constant convenient copper desired determined deviation dispersion electrodes elements Emission examined example exposure extinction coefficient fluorescent galvanometer glass graph half-prisms Hilger impurities Infra-red instrument intensity iron Judd Lewis known lamp layer lens light source lines magnesium material means measured metal minute trace observation ordinary passing photographic photometer plate potassium practical precise principle prism produced proportion Quantitative Spectroscopy quartz quartz spectrograph radiation Ratio Powder Ratio Quantitative System reduced refracted sample screen Sector Photometer shown in fig similar slit sodium spark spec spectral line spectrophotometry spectroscope Spectrum Analysis standard strontium substance tative telescope thallium thermopile thickness tion transmitted trum tube ultra-violet rays usually vanes violet visible wave-length Wood's glass X-ray zinc