High wavelength UV rays are used in

Fluorescent microscope.

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Polarising microscope.

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Ultraviolet microscope.

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Phase-contrast microscope.

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Solution

The correct option is A Fluorescent microscope.
Fluorescent microscope is a modification of ultraviolet microscope, which was made by Coons. The instrument uses long wave ultra violet rays for illumination. The microscope is useful in detecting those components which show autofluorescence, e.g., chlorophyll, collagen fibrils, vitamin A.

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