RPA Science GCSE Biology How to use a Light Mircosope RP

What is the purpose of the light source attached to the microscope?

• To provide power to the microscope

• To reflect light through the specimen

• To magnify the specimen

• To adjust the focus of the microscope

What is the correct order of lenses in the microscope from lowest to highest magnification?

• Times 4, times 10, times 40

• Times 40, times 10, times 4

• Times 10, times 4, times 40

• Times 4, times 40, times 10

How should the glass slide be held to avoid leaving fingerprints?

• By the edges only

• By the center

• With gloves on

• With a tissue

What is the purpose of adding iodine to the specimen?

• To stain the starch in the cells

• To increase the magnification

• To protect the cells

• To clean the microscope

What is the correct order of steps to focus the specimen?

• Raise the stage, adjust the fine focus, move the stage

• Move the stage, adjust the fine focus, raise the lens

• Adjust the mirror, move the stage, raise the lens

• Move the stage (coarse focus), adjust the fine focus

What is the purpose of using the fine focus dials?

• To move the stage up and down

• To adjust the brightness of the light source

• To make a blurry image clear

• To change the magnification

What is the purpose of using a transparent ruler under the microscope?

• To measure the size of the cells

• To draw the outline of the cells

• To clean the microscope

• To adjust the focus of the microscope

How many millimeters wide is the field of view in the microscope?

• 1 mm

• 2 mm

• 3 mm

• 4 mm

What is the unit used to measure cell size in microscopes?

• Millimeters

• Centimeters

• Micrometers

• Meters

How many micrometers are in a millimeter?

• 10

• 100

• 1,000

• 1,000,000