453b - — — The answer is(E The light bulb produces...

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Unformatted text preview: —+— The answer is (E) The light bulb produces unpolarized light, in which electric field vibrations are elgualhur probable in all directions perpendicular to the direction of propagation. The first polarizer has a horizontal transmission axis, so it will filter out all but the horizontal components of electric field vibrations, producing light that is polarized in the horizontal plane. The second polarizer has a vertical transmission axis, so it filters out all but the vertical electric field vibrations. The combination of two crossed polarizers is to completely absorb the light. However, if an optically active substance is interposed, it will rotate the hori- zontally polarized light emerging from the first polarizer that passes through it. Therefore, this light will have some vertical component to its electic field vibrations when it reaches the second polarizer. For this reason a portion of the light that passes through the sample will be able to make it through the second polal'lzer. The amount of brightness depends on the degree of optical rotation that occured in the substance. OPTICAL ACTWIT'I", THE AEILIT'I" OF A SUBSTANCE TCI RflTATE THE PLANE CIF FDLARIIED ”El-IT, iS A IIIII'EIT'I“lin'1P'l'Jl'liTiill‘il'l''|="|;|'PIC IH ORGANIC l:HEI'lI'IlSTII'l"A.l"-l3|I BIOCHEMISTRY. thlSTBIClCHEil-lICAL SUBSTANCES ARE OPTIC-ALB“ ACTIVE. c zoos .J nit—rest ...
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