2.2 Size of specimen

What is the formula for calculating magnification?

• Magnification = actual size × image size

• Magnification = image size ÷ actual size

• Magnification = actual size ÷ image size

• Magnification = image size + actual size

If the image size is 10 mm and the actual size is 2 mm, what is the magnification?

• 2.0

• 5.0

• 10.0

• 20.0

A microscope produces an image of a specimen that measures 15 mm. If the actual size of the specimen is 5 mm, what is the magnification?

• 1.5

• 3.0

• 5.0

• 10.0

If the magnification of a specimen is 20 and the actual size is 0.5 mm, what is the image size?

• 1 mm

• 5 mm

• 10 mm

• 20 mm

A biologist observes a cell under a microscope with a magnification of 200×. If the cell appears to be 8 mm long in the image, what is the actual size of the cell?

• 0.04 mm

• 0.4 mm

• 4 mm

• 40 mm

If the magnification is 50 and the image size is 25 mm, what is the actual size of the specimen?

• 0.5 mm

• 1 mm

• 2 mm

• 5 mm

If a bacterial cell appears 20 mm under a microscope and the actual size is 2 mm, what is the magnification?

• 5

• 10

• 15

• 20

A specimen is magnified to 120× its original size and the actual size is 0.8 mm. What is the image size?

• 0.1 mm

• 0.96 mm

• 96 mm

• 80 mm

A student measures an image of a plant cell and finds it to be 50 mm long. If the actual length of the cell is 0.25 mm, what is the magnification?

• 100

• 150

• 200

• 250

An image of a virus is observed at a magnification of 500×. If the actual size of the virus is 0.02 mm, what is the size of the image?

• 1 mm

• 5 mm

• 10 mm

• 0.1 mm