Ans: Yaqoob Kundi.
- He was a famous Arab philosopher.
- He has 244 books at his credit.
- He gave the idea about specific gravity and Waves.
- He worked in the field of optics and explained the appearance of blue colour in the sky.
- He explained the idea that gold cannot be made from other metals.
- He also explained music from scientific point of view by expressing the different notes of music in terms of frequencies.
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