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# Long description

Figure 11 shows an illustration of the main components of the hand spectroscope. The figure is drawn as two thin rectangles in landscape format so that they appear as square tubes, open at facing ends. The right tube (the barrel) is inserted into the left tube to make one long tube. At the left hand end of the long tube is an eyepiece lens, so that you can look into the tube. At the left hand end of the inserted tube is another lens and at the right hand end is a glass window. Inside the right hand part of the inserted tube is a prism. This is shown as three triangles, fitted together to make a trapezium.