The Light Microscop

e

Convex Lenses arecurved glass used to make microscopes(and glasses etc.)

Convex Lenses bendlight and focus it inone spot.

How a Microscope Works

How a Microscope Works

Ocular Lens(Magnifies Image)

Objective Lens(Gathers Light, Magnifies And Focuses Image Inside Body Tube)Body Tube

(Image Focuses)

•Bending Light: The objective (bottom) convex lens magnifies and focuses (bends) the image inside the body tube and the ocular convex (top) lens of a microscope magnifies it (again).

Body Tube

Nose Piece

ObjectiveLenses

Stage Clips

Diaphragm

Light Source

Ocular Lens

Arm

Stage

Coarse Adj.

Fine Adjustment

Base

Skip to Magnification Section

Eyepiece / Ocular Lens• Magnifies the specimen image• It is where you look through to view the

object placed on the stage.

Body Tube• It supports the eyepiece and lenses.• It also maintains the proper distance between

the eyepiece and the objective lenses.

Nose Piece• It holds the objective lenses and can be

turned to increase the magnification.

Objective Lenses

• It is used to magnify the images of the specimen to form an enlarged image.

Stage Clips• These 2 clips hold the slide/specimen

in place on the stage.

Diaphragm• It controls the amount of light on the

slide/specimen

Turn to let more light in or to make dimmer.

Mirror•It reflects light to the lens of the microscope.

Arm• It is the frame to which the base,

body and stage are attached.

Stage•Supports the slide/specimen

Coarse Adjustment Knob

•Moves the stage up and down LARGER focusing of the image.

• This knob moves the stage slightly to sharpen the image for PRECISION focusing.

Fine Adjustment Knob

Base•Supports the microscope and is

also used for carrying the microscope.

Magnification• To determine your magnification…

you just multiply the ocular lens by the objective lens

• Ocular 10x Objective 40x:10 x 40 = 400

Objective Lens have their magnificationwritten on them.

Ocular lenses usually magnifies by 10x

So the object is 400 times “larger”

Caring for a Microscope

•Clean only with a soft cloth/tissue

•Make sure it’s on a flat surface

•Carry it with 2 HANDS…one on the arm and the other on the base

Using a Microscope• Start on the lowest magnification• Don’t use the coarse adjustment

knob on high magnification … you’ll break the slide.

• Place slide on stage and lock clips• Adjust light source/ mirror.• Use fine adjustment to focus

Credits• You and the Natural World:

Integrated Science by Lilia G. Vengco and Teresita F. Religioso. Phoenix Publishing House, Inc.

• Discover Science by Allas, et. al. Diwa Learning Systems Inc.

• http://www.freeclubweb.com/powerpoints/science/index.html