Magnification practice questions

How many micrometres (µm) are there in 1 mm?

• 1,000

• 1,000,000

• 10,000

• 100,000

To calculate magnification we use......

• image size x actual size
• image size ÷ actual size
• actual size ÷ image size

To calculate image size we use.....

• actual size x magnification
• magnification ÷ actual size
• actual size ÷ magnification

To calculate actual size we use.....

• image size ÷ magnification

• image size x magnification

• magnification ÷ image size

If the image measures 100 mm and the scale bar is is 50 µm, what is the magnification?

• 2,000 x
• 150 x
• 5,000 x
• 20 x

If a scale bar measures 32 mm and it states it's length is 100 µm, what is the magnification?

• 320 x
• 3,200 x
• 0.32 x
• 32,000 x

If a bacteria image measures 450 mm and the magnification is 15,000x, what is the actual size of the bacteria?

• 30 µm
• 0.3 µm
• 300 µm
• 3,000 µm

An ant measures 2 mm in length in real life. If it is observed at x20 magnification, what is it's image length?

• 40 mm

• 10 mm

• 4 mm

• 0.1 mm

Josie measured the scale bar image to be 80 mm. Using the diagram to help you an you calculate the magnification used in this microscope image?

• x160

• x0.00625

• x0.16

• x25,000

Serena measured the image size of one of the bacterial cells to be 32 mm. If the magnification of the image is x8,000, what is the actual size of the bacterial cell?

• 4 μm

• 0.004 μm

• 256,000 μm

• 0.25 μm