Magnification and Actual Size Calculations

To calculate magnification we use......

• image size x actual size
• image size ÷ actual size
• actual size ÷ 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.  If it is observed at 20x magnification, what length should the scale bar be drawn at?

• 40 mm
• 10 mm
• 4 mm
• 0.1 mm

Serena measured the image of one of the bacterial cells to be 32 mm. If the magnification of the image is 8,000X, what is the actual size of the bacterial cell?

• 4 μm

• 0.004 μm

• 256,000 μm

• 0.25 μm

If each division is 100 µm, what is the size of this organism?

• 4 µm
• 400 µm
• 4,000 µm
• 400 mm

What steps should Burt use follow to calculate the actual size of each bacterial cell?

• Step 1: Calculate the magnification by measuring the scale bar image ÷ actual size

  Step 2: Measure image of bacterial cell ÷ magnification

• Step 1: Calculate the magnification by measuring the scale bar image x actual size

  Step 2: Measure image of bacterial cell ÷ magnification

• Step 1: Measure the image of the bacterial cell

  Step 2: Divide the image size by the scale bar size

• He can't, it is impossible to calculate

The higher the magnification, the ________ you see of the specimen.

• more
• less
• higher
• lower

Which is the correct equation to calculate image size -

• Image size = magnification / actual size

• Image size = magnification x actual size

• Image size = actual size / magnification

• Image size = actual size x magnification