Microscope

A certain microscope has two interchangeable objectives. One has a focal length of 2.0 cm, and the other has a focal length of 0.20 cm. If the length of the microscope is 18 cm, the magnifications for the following combinations: the 2.0 - cm objective and 5.0 - cm eyepiece, is…

• 20 x

• 40 x

• 45 x

• 50 x

• 55 x

What is the function of the diaphragm in a microscope?

• To magnify the image

• To hold the slide in place

• To reflect light into the objective lens

• To control the amount of light reaching the specimen

• To rotate the objective lenses

What kind of image is formed by the objective lens in a compound microscope?

• Virtual, upright, and enlarged

• Real, inverted, and enlarged

• Real, upright, and reduced

• Virtual, inverted, and reduced

• Real, upright, and enlarged

What happens to light rays after passing through the objective lens in a microscope?

• They diverge and form a virtual image

• They reflect and form a real image on the mirror

• They converge to form a real image before reaching the eyepiece

• They stay parallel and produce no image

• They scatter randomly inside the eyepiece

A microscope has a total magnification of 400×. If the eyepiece magnifies 20×, what must be the magnification of the objective?

• 10 x

• 15 x

• 20 x

• 30 x

• 40 x

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