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Unformatted text preview: PHY134 - Classical Physics II Laboratory Geometrical Optics This laboratory is to demonstrate how the very simple principles of reflection and refraction lead to sophisticated optical instruments. Equipment • Ray box, white light source, • 1 mirror, 1 protractor, 1 glass prism • Optical bench • 3 converging lenses, 1diverging lens • 2 lens holders • Ground glass screen with holder,. Method We begin with a ray box that has a slotted mask in front of a light bulb to produce a set of narrow beams (or "rays") of light. The rays lie along a plane surface (a sheet of paper). Your measurements will consist of pencil marks on the piece of paper, recording the direction of these rays before and after they strike a mirror or glass prism. Then you will progress to the study of lenses. Lenses are in essence refracting objects with precisely machined curved surfaces. Finally, you will construct simple two-lens optical instruments, a microscope and telescope. Procedure 1. Light Wave Reflection Use the ray box, a mirror, and protractor to verify that θ inc = θ reflected . Do this for at least three different incident (inc) angles θ inc . 2. Light Wave Refraction a. Snell's Law Use the ray box, a glass prism, and protractor to verify Snell's Law about refraction (refr): n inc sin θ inc = n refr sin θ refr , (1) where n inc and n refr are the refractive indices of the incident and refracting media, respectively. Take n air = 1 and n glass ≈ 1.5....
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