Question

How can resolving power of the instrument be increased?

• A. use UV light
• B. immerse in oil
• C. use IR light
• D. use one more lens.

Answer 1

Answer: (A), (B)

The correct options are
A use UV light
B immerse in oil

Resolving power for the instrument is found to be $\frac{\mu \sin \theta }{0.61\lambda }$ , UV light has short wavelength, hence higher resolving power. Oil is optically denser than air, that is, its $\mu$ is greater than that of air. Thus immersing in oil would increase the resolving power.