फ़ोटोमीटर
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thumb|fotomitar fotomitar (aangrezi:Photometer) ek vaijnanik upakaran hai. fotomitar ka avishkar edavard charls pikariang dvara kiya gaya tha. yah do srotoan ki pradipan tibrata ki tulana karane mean kam ata hai.
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sanbandhit lekh
varnamala kramanusar lekh khoj
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