Final answer:
The theory of electromagnetism is most applicable to discussing the different types of light, including both visible and invisible spectrums. This theory, underpinned by Maxwell's equations, helps us understand the propagation of light and the interaction between electric and magnetic fields.
option d is the correct
Step-by-step explanation:
The theory of electromagnetism is best suited for discussing d. the different types of light, both visible and invisible, as it directly pertains to the study of electromagnetic radiation, which includes light in all its forms.
Electromagnetism plays a pivotal role in understanding how light interacts with matter, how it is produced, and how it is detected. Whether discussing the visible spectrum that we can see with our eyes, or the broader electromagnetic spectrum encompassing radio waves, microwaves, infrared, ultraviolet, X-rays, and gamma rays, the principles of electromagnetism are fundamental.
Through the theory of electromagnetism, developed by James Clerk Maxwell, we understand that light is a form of electromagnetic radiation. Maxwell's equations describe how electric and magnetic fields propagate through space as waves. This also elucidates why a compass needle is deflected when brought near a wire carrying an electric current, as the electric current creates a magnetic field around the wire, demonstrating the intimate relationship between electricity and magnetism that Maxwell described.