Final answer:
A fluorescent microscope is needed to visualize a GFP fusion protein. It uses short wavelength, high-energy light to excite the fluorophore attached to the GFP, causing it to emit fluorescent light.
Step-by-step explanation:
The equipment needed to visualize a GFP fusion protein is a fluorescent microscope. A fluorescent microscope is specifically designed to detect and observe fluorescent molecules, such as GFP. It uses short wavelength, high-energy light to excite the fluorophore attached to the GFP, causing it to emit fluorescent light that can be visualized.