Biology - Microscope

Microscope

Microscope

An instrument which is used to make small objects look bigger or magnify small objects which are invisible to the naked eyes

Magnification

Magnification is the number of times the image of the object is enlarged (magnified) as compared to the specimen.

Magnification formulae

Magnification= size of drawing (image) /Actual size of specimen (object) SI unit XNumber

Eye piece

Contains the lens that magnifies the specimen

Tube

Hold the lenses of the eyepiece and the objective at the correct working distance from each other

Coarse adjustment wheel

Moves the tube up and down to bring the specimen into focus

Fine adjustment wheel

Used for final focusing when observing under high power magnification

Rotating nosepiece

Holds objectives with low power and high power lenses on rotating disc

Objective lens

Enlarges the image from lower to higher power magnification

Arm

Joins the base and stage to the tube and supports the adjustment wheel.

Stage

Supports slides over an opening which transmits light from a mirror or electric light source below it

Diaphragm

Controls the amount of light directed onto and passing through the object.

Mirror/light source

Directs light upward through the condenser and the opening on the stage.

Base

Provides a firm support for the weight of the microscope

Biology

The study of living things (organisms).

Respiration

The release of energy from food substances inside living cells.

Aerobic respiration

Energy release in the presence of oxygen.

Anaerobic respiration

Energy release in the absence of oxygen.

Autotrophic nutrition

The type of nutrition where an organism makes its own food.

Heterotrophic nutrition

The type of nutrition where an organism obtains food from other organisms.