Question:
A microscope will have maximum resolving power if, to illuminate the specimen, it uses light of
A microscope will have maximum resolving power if, to illuminate the specimen, it uses light of
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Smaller wavelength always gives better resolution in optical instruments.
Updated On: Feb 11, 2026
- red colour.
- green colour.
- yellow colour.
- blue colour.
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The Correct Option is D
Solution and Explanation
Step 1: Resolving power of a microscope.
Resolving power is inversely proportional to the wavelength of light used:
\[ \text{Resolving power} \propto \frac{1}{\lambda} \]
Step 2: Compare wavelengths of colours.
Among visible colours, blue light has the shortest wavelength.
Step 3: Effect on resolving power.
Shorter wavelength results in smaller diffraction limit and better resolution.
Step 4: Conclusion.
Therefore, a microscope has maximum resolving power when blue light is used.
Resolving power is inversely proportional to the wavelength of light used:
\[ \text{Resolving power} \propto \frac{1}{\lambda} \]
Step 2: Compare wavelengths of colours.
Among visible colours, blue light has the shortest wavelength.
Step 3: Effect on resolving power.
Shorter wavelength results in smaller diffraction limit and better resolution.
Step 4: Conclusion.
Therefore, a microscope has maximum resolving power when blue light is used.
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