journal of kerbala university

In this paper, samples of the polystyrene material have been prepared in the form of discs with a diameter of (3cm) and its thickness of (0.384 cm) and added blue material with various weight rates and they are (pure, 10%, 15%).
some optical properties of the polystyrene were studied which was prepared before and after adding the Methyl blue material.
Through the checking of samples by the absorption and transmission in the range of wave lengths (250-1000)nm by using (UV- Spectrophotometer) and results the absorption coefficient and the optical energy gap were calculated to indirectly transfer the allowed, the forbidden, and the extinct coefficient . Thus ,we come to the conclusion that the values of the absorption Coefficient and the extinction Coefficient for the prepared samples hare increased with the increase of the added rate of the methyl blue whereas the values of the optical energy gap regarding the allowed and prevented indirect transfer hare decreased with the increase of the added rate of the methyl blue .