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SingaporeBiotechnologyQuick questions

Cells and Microorganisms

Quick questions on Microscopy and cell measurement: O-Level Cells and Microorganisms

6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is the light microscope?
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A light microscope passes light through a thin specimen and uses two lenses to magnify it: the objective lens close to the specimen and the eyepiece lens you look through. The total magnification is the product of the two lens magnifications.
What is total magnification?
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$total magnification=eyepiece magnification×objective magnification\text{total magnification} = \text{eyepiece magnification} \times \text{objective magnification}$
What is the magnification equation?
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The key relationship links the size of the image, the real (actual) size, and the magnification:
What is q1?
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State the equation linking magnification, image size and actual size. [1 mark]
What is q2?
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An image of a cell is 30 mm30\ \text{mm} wide at ×300\times300. Find the actual width in micrometres. [2 marks]
What is q3?
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A microscope has a ×10\times10 eyepiece and a ×40\times40 objective. State the total magnification. [1 mark]

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