A little ranges of the frequencies 380-760 nm is kind of electromagnetic waves which the human eye reacts. For spectral analyses needs Plucker tubes with the variety gases, spectrometer, a packet of absorption and polarisation filters. We want to show that the same can be do with uses compact disc CD, its plastic cover and sunglasses which are sale for children.
CD is diffraction grating about grating constant range 1.2-1.7 micrometers (discs DVD are grating constant about 0.7-0.9 micrometers). This constant can calculated by measuring 1°, 2° and further grating order of the red laser pointer (wavelength of the emission light is usually 660-680 nm). The spectrum of the bulb and a fluorescent lamp shows that physical nature these sources is different [1].
The sunglasses are two kinds: the first is "normal" which is simply absorbs the light like absorbing filters, the seconds have the think layers reflection.
Band filters are "Pink sunglasses" - with just thin layer reflection about diffraction property [2]. These type films have clearly complementary spectrums: reflection (for example, yellow colour) and transmission (deep-blue) [3].
A simple sunglasses weakens intensity of light in the sufficiently broad range of the frequencies The ones are a absorbent filters which contained the many-coloured dyes about complicated characteristics absorption [4].
[1] D. Pliszka, T. Wróblewski, M. Brozis, G. Karwasz, "Simple experiments with the sources of the light", Physics in School, Nr 4, 2000, internet: http://zabawki.pap.edu.pl/new/files/articles/cd/cd.html [in Polish],
[2] Pink glasses, http://zabawki.pap.edu.pl/new/files/optyka/rozokulary.html [in Polish],
[3] Golden tower, http://zabawki.pap.edu.pl/new/files/optyka/wierza.html [in Polish],
[4] Sunglasses, http://zabawki.pap.edu.pl/new/files/optyka/okulary-sun.html
and Fluorescent spoons http://zabawki.pap.edu.pl/new/files/optyka/lyzeczki.html [in Polish].