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A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution?

1. Blue
2. Green
3. Yellow
4. Red

Correct answer: Blue

Solution

A light microscope’s resolving power increases when the illumination wavelength is smaller. Among the given colors, blue light has the shortest wavelength, so it gives the best resolution.

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