using a microscope

• A convenient source of large cells to look at is an onion
• to make a slide from onion cells it is best to use the membrane between layers
• to look at the membrane of an onion we should put some on a glass slide
• we should stain onion cell with iodine solution
• before looking at a slide, we put on a cover slip
• we look at the prepared slide with a microscope we start with the smallest objective lens and then gradually increase the magnification
• we start by making the gap between objective lens and slide as small as possible, while looking at it from the side
• when looking through the eyepiece, we can adjust the focus knob until the image becomes clearer
• if the image is blurry, we need to move the stage up or down so that the specimen comes into focus
• higher power lenses have smaller fields of view
• to see more detail, we use higher power lenses