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# Investigating optical properties of Jelly.

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Introduction

﻿Candidate Name: Session: May 2015 Page | International Baccalaureate Diploma Program (IBDP) Session: May 2015 Physics HL Lab Report Lab Report Title: Investigating optical properties of Jelly. Criteria Assessed: * Design (D) Candidate Name: Candidate Number: International School, Singapore RESEARCH QUESTION: What is the relationship between the temperature and the refractive index of Jelly? INTRODUCTION: When a beam of light of any wavelength travels, it bends towards or away from its normal and this phenomena is known as refraction. The refractive index, n, is given:. While travelling from less to a more optically dense medium, the beam of light slows down and bends towards the normal and while travelling from a dense to a less optically dense medium, the beam of light speeds up and bends away from the normal. Strawberry Jelly is an optically denser medium compared to air and hence, when an incident beam of light travels from air into the Jelly, it slows down and bends towards the normal. In this investigation, the refractive index of a translucent cube of strawberry Jelly is investigated. Regardless of the ingredients, Jelly is formed by crystallization and the rigidity of the structure of the crystals is dependent on its temperature. Thus, the temperature can alter the optical density of Jelly as a result of which, the refractive index of the translucent cube of Strawberry Jelly changes with temperature. ...read more.

Middle

APPARATUS AND CHEMICALS: Serial No. Name Uncertainty (if any) Capacity OR Quantity Purpose 1. Jelly - Excess To investigate its refractive index. 2. Sharp brimmed rectangular bowl - 1 To cut equal dimensions of Jelly cuboid for each experiment. 3. Low walled rectangular bowl - 1 To hold the cuboid of Jelly while light is being passed through it. 4. White paper board - 1 To function as the plane of refraction. 5. Board pins - 6 To mark the positons of the incident and refracted rays. 6. Protractor ±0.5o 1 To measure the angles of incidence and refraction. 7. Pencil and Ruler - 1 To trace the path of the beam of light. 8. Electronic water bath - 1 To change the temperature of the Jelly and stably maintain it. 9. Thermometer ±0.25oC 1 To check the temperature of the Jelly. PROCEDURE: 1. Excess of the same kind of Jelly was prepared by following the manufacturer’s instruction at the back of the packaging. 2. The white paper board was laid out flat on the work table and the low walled rectangular bowl was placed on top of it. 3. Using a pencil and a ruler, the low walled rectangular bowl was traced out on the white paper board. 4. With a pencil, ruler and the protractor, an incident ray was drawn on one side of the traced rectangle. 5. ...read more.

Conclusion

3. Ensure pins are not too thick and they are not bent. 4. While tracing the path of the pins, adjust height of viewing to ensure no parallax errors. Preferably, close one eye to isolate unnecessary lights. 5. Ensure thickness of cling film is negligible as it can have its own refractive properties. 6. Ensure straight lines for the rays and make sure the normal line drawn are parallel to the other. 7. Make sure that pins are appropriately spaced apart so that a more accurate determination of angle is allowed. Labelled Diagrams: Figure 1: Setting up Jelly onto high-walled rectangular bowl. Figure 2: The different parameters of the experiment. RAW DATA COLLECTION: (Sample) Temperature (°C) ± 0.25oC Angle of Incidence / i (o) ± 0.5o Angle of Refraction / r (o) ±0.5oC Trial 1 Angle of Refraction / r (o) ±0.5oC Trial 2 Angle of Refraction / r (o) ±0.5oC Trial 3 Angle of Refraction / r (o) ±0.5oC Trial 4 Angle of Refraction / r (o) ±0.5oC Trial 5 10.0 45.0 20.0 45.0 30.0 45.0 40.0 45.0 50.0 45.0 RAW DATA PROCESSING: (Sample) Temperature (°C) ± 0.25oC Angle of Incidence / i (o) ± 0.5o Angle of Refraction / r (o) ±0.5oC Average sin i sin r Refractive index (n) 10.0 45.0 20.0 45.0 30.0 45.0 40.0 45.0 50.0 45.0 The values for temperature can be plotted against Refractive index (n); refractive index on the y-axis and temperature of the Jelly on the x-axis. ...read more.

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