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A microscope is used with sodium light and its resolving power is not sufficiently large.Higher resolution will be obtained by using wavelength of

1. 20 micron
2. 2 micron
3. 1 micron
4. \( 400 \mathrm{A}^{\circ} \)

Correct answer: \( 400 \mathrm{A}^{\circ} \)

Solution

A microscope’s resolving power increases as the wavelength decreases, so using a shorter wavelength gives better resolution. Among the choices, 400 Å is the smallest wavelength, so it provides the highest resolving power.

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