Microscopes

Mr. SkirbstLife Science

Topic 02

Microscope

micro - - scope

- an instrument used to look at very small objects

Simple MicroscopeSimple Microscope – one convex

lens:Ex. Human Eye

Simple Microscopeconvex lens refracts (bends)

light to a focal point.

Ex. drop of water

Simple MicroscopeFocal 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 MicroscopeImproved byLeeuwenhoek

“Father ofMicrobiology”

Compound Microscope

Compound MicroscopeKey Points:

A –ArmB – BaseC – Carry

* use dominant eyeS – Store * open both eyesL – LowO – ObjectiveP – Power

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

Stereo MicroscopeCompound microscope with two

eyepiece lenses

Stereo MicroscopeEnables viewer tohave binocularvision –

3D (depth)