Science, Maths & Technology
Practising science: Reading the rocks and ecology
...2. Some additional hints are: Hold the hand lens 2–3 cm from your eye and bring the object up towards the lens until it is in focus. Make sure the surface of the object is well lit from the side. Keep the hand lens and the object parallel to each other and hold both steady. With rough surfaces you have to move the object back and forth to bring different parts into...