Which one of the following microscopes can be used for studying unstained and dividing cells?

Electron microscope

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Phase-contrast microscope

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Polarising microscope

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All the above

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Solution

The correct option is C Phase-contrast microscope
Phase contrast is used to enhance the contrast of light microscopy images of transparent and colourless specimens. It enables visualisation of cells and cell components that would be difficult to see using an ordinary light microscope. Phase contrast does not require cells to be killed, fixed or stained.
Hence the correct answer is (B)

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