Introduction

This experiment shows how different materials can allow light to pass through them easily, partially block light and completely block light. We call these materials transparent, translucent and opaque. Suitable materials for testing include different coloured plastics and paper, different weights of paper and fabrics of different thicknesses.

Datalogger set up to record light intensity	Another view of the setup

Apparatus

2 clamp stands; light sensor; collection of transparent, translucent and opaque materials; power pack; light box

Method

• Set up the apparatus as shown in the pictures. The shroud to cut out ambient light around the end of the light sensor is made by sellotaping black paper around the end of the sensor.
• Put end of shroud tight up against test material.
• Start datalogger.
• Record readings in a table like the one shown below. You will have to draw this on a piece of paper.

Analysis

Use the software to transfer the readings to the computer, or manually put the results into a spreadsheet (as shown below) to produce a table and graph. If possible, find more materials to test.

Click here to see the graph showing a series of results.

Click here to open a worksheet.

For setting up instructions, click below on the datalogger you are using: