EduNinja
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An eyepiece graticule can be calibrated using a stage micrometer.
What is the correct reason why an eyepiece graticule is calibrated?

A

An eyepiece graticule can be used to make measurements.

B

An eyepiece graticule is magnified by the objective lens.

C

An eyepiece graticule magnifies the specimen.

D

An eyepiece graticule makes comparisons.

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A prokaryotic cell which is 1μ m1 \mu \mathrm{~m} in diameter is magnified 50000 times in an electron micrograph. What is the diameter of the cell in the electron micrograph?

A

5×10−1 mm5 \times 10^{-1} \mathrm{~mm}

B

5×100 mm5 \times 10^{0} \mathrm{~mm}

C

5×101 mm5 \times 10^{1} \mathrm{~mm}

D

5×102 mm5 \times 10^{2} \mathrm{~mm}

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The diagram shows a stage micrometer scale viewed with an eyepiece graticule, using a magnification of ×200\times 200.

Question image

Using the same magnification, a chloroplast is measured as 4 eyepiece graticule divisions long.
How long is the chloroplast?

A

1.0×101μ m1.0 \times 10^{1} \mu \mathrm{~m}

B

4.0×102μ m4.0 \times 10^{2} \mu \mathrm{~m}

C

2.5×10−1μ m2.5 \times 10^{-1} \mu \mathrm{~m}

D

2.5×10−2μ m2.5 \times 10^{-2} \mu \mathrm{~m}

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