What do light waves look like?

In the electromagnetic spectrum, visible light waves are the only waves which are visible to human eyes. It looks like rainbow colors, with each color having different frequencies and wavelenghts.You can read about LIGO India – Gravitational Wave Detector in India in the given link.

Further readings:

1. Topic-Wise GS 3 Questions for UPSC Mains
2. Science & Technology Notes For UPSC – General Science Notes