Glass as Evidence Practice Refractive Index Problems

Formulas for Math Problems A ray of light approaches a body of water at an angle of incidence of 45º. The medium in which the light enters (water) causes an angle of refraction of 32º. What is the refractive index of the water? A ray of light approaches a piece of typical crown glass at an angle of incidence of 45º. The medium in which the light enters (typical crown glass) causes an angle of refraction of 28º. What is the refractive index of typical crown glass? A ray of light approaches a diamond at an angle of incidence of 45º. The medium in which the light enters (the diamond) causes an angle of refraction of 17º. What is the refractive index of diamonds? The refractive index of heavy flint glass is approximately 1.65. Using that piece of information, what is the speed of light through heavy flint glass in meters The refractive index of lead is approximately 2.6. Using this piece of information, what is the speed of light through lead in meters A ray of light approaches glycerin at an angle of incidence of 41º. The refractive index of glycerin is approximately 1.473. Given this scenario, what is the angle of refraction as the ray of light passes through the medium? Hint: To find the final angle measure use Sin-1 of the decimal value As a ray of light approaches sapphire, the medium (sapphire) causes an angle of refraction of 19º. The refractive index of sapphire is approximately 1.77. Given this scenario, at what angle of incidence did the ray of light approach the sapphire? Hint: To find the final angle measure use Sin-1 of the decimal value A beam of light passes from ethanol (n1 = 1.36) into diamond (n2 = 2.42) at an angle of 42º. What is the angle of refraction? Hint: Use Snell’s Law A ray of light travels through air before passing through a piece of glass. As the light travels through the glass medium the angle of incidence was 30 degrees with the normal. If the index of refraction of the glass is 1.65, what is the angle of the refracted ray within the glass with respect to the normal? (nair = 1.00) Carbon tetrachloride (n2 = 1.46) is poured into a container made of crown glass (n1 = 1.52). If the light ray in glass incident on the glass-to-liquid boundary makes an incidence angle of 30 degrees with the normal, what is the angle of the corresponding refracted ray with respect to the normal? Review the diagram below. Find the unknown refractive index (n2). Review the diagram below. Find the angle of incidence. Part 2: Use the information in the Data Table below to help solve the questions below Review the diagram below and determine what medium the light traveled through after leaving the glass? CO2 Plexiglass Acetone Ruby Diamond Plate glass Water Sapphire You have been called in to investigate a burglary at a local jewelry shop. During the burglary an unknown substance was found and is being used as evidence. Mr. Charm is the primary suspect who recently proposed to his girlfriend. The ring he proposed to her with was missing a stone. He claims that there is no way the ring he presented to his girlfriend was stolen from the jewelry shop because the missing stone is made from a sapphire stone. You are tasked with determining the unknown substance composition. Through experimentation you find the speed of light passes through the substance at 1.67x108 m CO2 Plexiglass Acetone Ruby Diamond Plate glass Water Sapphire What can we conclude about Mr. Charms alibi? The jackets of two potential suspects from the crime scene were recovered which contain an unknown substance.Suspect A claims he was working in his greenhouse during the time of the crime cleaning up the particles of the plexiglass windows that were recently cracked with a rock.Suspect B claims he was at his bar replacing the store front plate glass windows which were recently broken during a bar fight.You discovered that the unknown substance travels at a speed of 2.013 x 108 m Calculate the refractive index of the unknown substance? What is the source of the unknown substance found on the jacket? Diamond Plate glass Ruby Plexiglass Sapphire Which suspect does the jacket found at the crime scene most likely belong to? Why? Part 3: Video Case Study - Shattered Dreams As you watch the video below answer the questions that follow In what state did the crime take place? What was the crime? What was found at the crime scene? What was NOT found at the crime scene? What piece of evidence was found beneath one victim’s body? How was one victim’s fiancé cleared as a suspect What was the reason police felt the murders took place at a different location? Explain why refracted index tests was performed by forensic scientists. What did a background check on one of the suspect’s reveal? What were two things that police learned when they examined the lone piece of forensic evidence at the crime scene? Why did the suspect’s sweatshirt become a piece of evidence? What did police investigators believe was done with the murder weapon? What additional audio evidence was used against the suspect? What conviction and sentence did the killer receive?