Microscopes and magnification

Microscopes

• What does it do?
• see objects naked eyes can't
• help build small objects
• examine bullets in forensic investigations
• gather info about how microorganisms interact
• view bacteria
• view cancer cells
• How to use a microscope:
• move stage to the lowest position
• select lens with lowest magnification
• place the slide on the stage
• raise stage to highest position
• turn on light and look through eyepiece
• turn course focus until you see the object
• turn fine knob until you see the object clearly
• to see with higher detail, repeat with higher magnification lens
• Microscope facts:
• they use convex lenses
• cells were named cells by Robert Hooke as they looked like corks, tiny units of life
• Parts of a microscope:
• eyepiece - where you look into the microscope
• coarse focus - big knob
• fine focus - small knob
• light - underneath it
• slide - glass piece to put things in
• stage - where slide goes
• objective lens - other side of the tube

Magnification

• definitions:
• magnification - the degree of which the size of the image is larger than the object itself
• resolution - the degree to which it is possible to distinguish between 2 separate points
• Formula:
• magnification = image size / actual size
• 
• Caption: Measuring length