Determination of Refractive Index of glass.pptx

Determination of Refractive Index of Glass

1. D. P. Gangwar (M.Sc. Physics/Electronics) Director, DP Forensic Science Lab & Institute Mo: 9569099174, [email protected] Determination of Refractive Index (RI) of Glass Samples for Comparison two Glass Samples Questioned Glass sample Collected from SOC Control Glass sample Collected from known object

2. Refractive Index(RI) Determination of Glass What is RI : Refractive Index (RI) is a physical property, it describes how much light bends, or refracts, when it passes from a vacuum into a specific medium. The formula for the refractive index is: n=c/v or RI=speed of light in Vacuum /speed of light in media

3. Refractive Index(RI) of different Material Glass

4. Variation Refractive Index(RI) It varies with Temperature wavelength of used light

5. Determination of Refractive Index(RI)

6. Beck Line If the RI of the liquid is different from the RI of the glass, a halo-like ring appears around the edge of the glass. This halo like ring called the Beck Line. This appears because the refracted light becomes concentrated around the edges fragment. matched Grater than Less than Nl = Ng Nl > Ng Nl <Ng

7. For Further study/information pl contact Mo: 9569099174 [email protected] Forensic Examination of Glass