Final answer:
Radio telescopes have poorer resolution than optical telescopes because of the longer radio wavelengths they detect. Interferometry is used to improve this by linking multiple radio telescopes.
Step-by-step explanation:
One disadvantage of radio telescopes compared to optical telescopes is that they generally have poorer resolution due to the longer wavelengths of radio waves. While optical telescopes can make out fine details using a relatively small aperture, radio telescopes require much larger dishes to achieve comparable resolution. To counteract this limitation, radio astronomers use a technique called interferometry, which involves electronically linking multiple radio telescopes to improve the overall resolution.