Microscopes Mr. Skirbst Life Science Topic 02

Microscope micro -- scope - an instrument used to look at very small objects

Simple Microscope Simple Microscope – one convex lens: Ex. Human Eye

Simple Microscope convex lens refracts (bends) light to a focal point. Ex. drop of water

Simple Microscope Focal length determines magnification power Ex. Lenses with more curvature, magnify more

Compound Microscope - uses two lenses called eyepiece and objective lenses -multiplies magnification -requires light source

Compound Microscope Improved by Leeuwenhoek “Father of Microbiology”

Compound Microscope

Key Points: A –Arm B – Base C – Carry * use dominant eye S – Store* open both eyes L – Low O – Objective P – Power

Compound Microscope Focusing images : -Raise body tube -Place specimen on stage -Lower body tube -Focus UP (Coarse, then Fine)

Stereo Microscope Compound microscope with two eyepiece lenses

Stereo Microscope Enables viewer to have binocular vision – 3D (depth)